diff --git a/src/runtime-arr/chart.arr b/src/runtime-arr/chart.arr
index b0931a2ae4..5362b14336 100644
--- a/src/runtime-arr/chart.arr
+++ b/src/runtime-arr/chart.arr
@@ -3,21 +3,18 @@ provide-types *
 
 import global as G
 import chart-lib as CL
+import either as E
 import image as IM
 import list as L
 import option as O
 
 include from O: type Option end
 
-################################################################################
-# CONSTANTS
-################################################################################
-
-
 ################################################################################
 # TYPE SYNONYMS
 ################################################################################
 
+type PlottableFunction = (Number -> Number)
 type Posn = RawArray<Number>
 type TableIntern = RawArray<RawArray<Any>>
 
@@ -25,8 +22,13 @@ type TableIntern = RawArray<RawArray<Any>>
 # HELPERS
 ################################################################################
 
+fun check-num(v :: Number) -> Nothing: nothing end
+fun check-string(v :: String) -> Nothing: nothing end
+
 posn = {(x :: Number, y :: Number): [G.raw-array: x, y]}
 
+unsafe-equal = {(x :: Number, y :: Number): (x <= y) and (y <= x)}
+
 fun map2(xs :: L.List<Any>, ys :: L.List<Any>):
   L.map2({(x, y): [G.raw-array: x, y]}, xs, ys)
 end
@@ -39,12 +41,11 @@ fun to-table2(xs :: L.List<Any>, ys :: L.List<Any>) -> TableIntern:
   L.to-raw-array(L.map2({(x, y): [G.raw-array: x, y]}, xs, ys))
 end
 
-# TODO(tiffany): add in get-vs-from-img after VS is implemented
-
-################################################################################
-# METHODS
-################################################################################
+fun to-table3(xs :: L.List<Any>, ys :: L.List<Any>, zs :: L.List<Any>) -> TableIntern:
+  L.to-raw-array(L.map3({(x, y, z): [G.raw-array: x, y, z]}, xs, ys, zs))
+end
 
+# TODO(tiffany): add in get-vs-from-img after VS is implemented
 
 ################################################################################
 # BOUNDING BOX
@@ -90,10 +91,44 @@ fun get-bounding-box(ps :: L.List<Posn>) -> BoundingBox:
   end
 end
 
+fun merge-bounding-box(bs :: L.List<BoundingBox>) -> BoundingBox:
+  for L.fold(prev from default-bounding-box, e from bs):
+    ask:
+      | e.is-valid and prev.is-valid then:
+        default-bounding-box.{
+          x-min: G.num-min(e.x-min, prev.x-min),
+          x-max: G.num-max(e.x-max, prev.x-max),
+          y-min: G.num-min(e.y-min, prev.y-min),
+          y-max: G.num-max(e.y-max, prev.y-max),
+          is-valid: true,
+        }
+      | e.is-valid then: e
+      | prev.is-valid then: prev
+      | otherwise: default-bounding-box
+    end
+  end
+end
+
 ################################################################################
 # DEFAULT VALUES
 ################################################################################
 
+type BoxChartSeries = {
+  tab :: TableIntern,
+  height :: Number,
+  horizontal :: Boolean
+}
+
+default-box-plot-series = {
+  horizontal: false
+}
+
+type PieChartSeries = {
+  tab :: TableIntern,
+}
+
+default-pie-chart-series = {}
+
 type BarChartSeries = {
   tab :: TableIntern,
   legends :: RawArray<String>,
@@ -102,6 +137,54 @@ type BarChartSeries = {
 
 default-bar-chart-series = {}
 
+type HistogramSeries = {
+  tab :: TableIntern,
+  bin-width :: Option<Number>,
+  max-num-bins :: Option<Number>,
+  min-num-bins :: Option<Number>,
+}
+
+default-histogram-series = {
+  bin-width: O.none,
+  max-num-bins: O.none,
+  min-num-bins: O.none,
+}
+
+type LinePlotSeries = {
+  ps :: L.List<Posn>,
+  color :: Option<IM.Color>,
+  legend :: String,
+}
+
+default-line-plot-series = {
+  color: O.none,
+  legend: '',
+}
+
+type ScatterPlotSeries = {
+  ps :: L.List<Posn>,
+  color :: Option<IM.Color>,
+  legend :: String,
+  point-size :: Number,
+}
+
+default-scatter-plot-series = {
+  color: O.none,
+  legend: '',
+  point-size: 7,
+}
+
+type FunctionPlotSeries = {
+  f :: PlottableFunction,
+  color :: Option<IM.Color>,
+  legend :: String,
+}
+
+default-function-plot-series = {
+  color: O.none,
+  legend: '',
+}
+
 ###########
 
 type ChartWindowObject = {
@@ -118,6 +201,29 @@ default-chart-window-object :: ChartWindowObject = {
   render: method(self): G.raise('unimplemented') end,
 }
 
+type BoxChartWindowObject = {
+  title :: String,
+  width :: Number,
+  height :: Number,
+  x-axis :: String,
+  y-axis :: String,
+  render :: ( -> IM.Image),
+}
+
+default-box-plot-chart-window-object :: BoxChartWindowObject = default-chart-window-object.{
+  x-axis: '',
+  y-axis: '',
+}
+
+type PieChartWindowObject = {
+  title :: String,
+  width :: Number,
+  height :: Number,
+  render :: ( -> IM.Image),
+}
+
+default-pie-chart-window-object :: PieChartWindowObject = default-chart-window-object
+
 type BarChartWindowObject = {
   title :: String,
   width :: Number,
@@ -136,14 +242,110 @@ default-bar-chart-window-object :: BarChartWindowObject = default-chart-window-o
   y-max: O.none,
 }
 
+type HistogramChartWindowObject = {
+  title :: String,
+  width :: Number,
+  height :: Number,
+  render :: ( -> IM.Image),
+  x-axis :: String,
+  y-axis :: String,
+  x-min :: Option<Number>,
+  x-max :: Option<Number>,
+  y-max :: Option<Number>,
+}
+
+default-histogram-chart-window-object :: HistogramChartWindowObject =
+  default-chart-window-object.{
+    x-axis: '',
+    y-axis: '',
+    x-min: O.none,
+    x-max: O.none,
+    y-max: O.none,
+  }
+
+type PlotChartWindowObject = {
+  title :: String,
+  width :: Number,
+  height :: Number,
+  render :: ( -> IM.Image),
+  x-axis :: String,
+  y-axis :: String,
+  x-min :: Option<Number>,
+  x-max :: Option<Number>,
+  x-max :: Option<Number>,
+  y-max :: Option<Number>,
+  num-samples :: Number,
+}
+
+default-plot-chart-window-object :: PlotChartWindowObject = default-chart-window-object.{
+  x-axis: '',
+  y-axis: '',
+  x-min: O.none,
+  x-max: O.none,
+  y-min: O.none,
+  y-max: O.none,
+  num-samples: 1000,
+}
+
 ################################################################################
 # DATA DEFINITIONS
 ################################################################################
 
 data DataSeries:
+  | line-plot-series(obj :: LinePlotSeries) with:
+    is-single: false,
+    color: method(self, color :: IM.Color):
+      line-plot-series(self.obj.{color: O.some(color)})
+    end,
+    legend: method(self, legend :: String):
+      line-plot-series(self.obj.{legend: legend})
+    end,
+  | scatter-plot-series(obj :: ScatterPlotSeries) with:
+    is-single: false,
+    color: method(self, color :: IM.Color):
+      scatter-plot-series(self.obj.{color: O.some(color)})
+    end,
+    legend: method(self, legend :: String):
+      scatter-plot-series(self.obj.{legend: legend})
+    end,
+    point-size: method(self, point-size :: Number):
+      scatter-plot-series(self.obj.{point-size: point-size})
+    end,
+  | function-plot-series(obj :: FunctionPlotSeries) with:
+    is-single: false,
+    color: method(self, color :: IM.Color):
+      function-plot-series(self.obj.{color: O.some(color)})
+    end,
+    legend: method(self, legend :: String):
+      function-plot-series(self.obj.{legend: legend})
+    end,
+  | pie-chart-series(obj :: PieChartSeries) with:
+    is-single: true,
   | bar-chart-series(obj :: BarChartSeries) with:
     is-single: true,
-    constr: {(): bar-chart-series},
+  # TODO(tiffany): add box-plot-series in by adding a |
+  # box-plot-series(obj :: BoxChartSeries) with:
+  #  is-single: true,
+  #  horizontal: method(self, h):
+  #    box-plot-series(self.obj.{horizontal: h})
+  #  end
+  | histogram-series(obj :: HistogramSeries) with:
+    is-single: true,
+    method bin-width(self, bin-width :: Number):
+      histogram-series(self.obj.{bin-width: O.some(bin-width)})
+    end,
+    method max-num-bins(self, max-num-bins :: Number):
+      histogram-series(self.obj.{max-num-bins: O.some(max-num-bins)})
+    end,
+    method min-num-bins(self, min-num-bins :: Number):
+      histogram-series(self.obj.{min-num-bins: O.some(min-num-bins)})
+    end,
+    method num-bins(self, num-bins :: Number):
+      histogram-series(self.obj.{
+        min-num-bins: O.some(num-bins),
+        max-num-bins: O.some(num-bins)
+      })
+    end,
 # TODO(tiffany): add _output and test get-vs-from-img after VS is implemented
 end
 
@@ -156,30 +358,79 @@ fun check-chart-window(p :: ChartWindowObject) -> Nothing:
 end
 
 data ChartWindow:
+  | pie-chart-window(obj :: PieChartWindowObject) with:
+    title: method(self, title :: String): pie-chart-window(self.obj.{title: title}) end,
+    width: method(self, width :: Number): pie-chart-window(self.obj.{width: width}) end,
+    height: method(self, height :: Number): pie-chart-window(self.obj.{height: height}) end,
+    display: method(self):
+      _ = check-chart-window(self.obj)
+      self.obj.{interact: true}.render()
+    end,
+    get-image: method(self):
+      _ = check-chart-window(self.obj)
+      self.obj.{interact: false}.render()
+    end,
+  # TODO(tiffany): add box-plot-chart-window in with a |
+  # box-plot-chart-window(obj :: BoxChartWindowObject) with:
+  #  x-axis: method(self, x-axis :: String): box-plot-chart-window(self.obj.{x-axis: x-axis}) end,
+  #  y-axis: method(self, y-axis :: String): box-plot-chart-window(self.obj.{y-axis: y-axis}) end,
+  #  title: method(self, title :: String): box-plot-chart-window(self.obj.{title: title}) end,
+  #  width: method(self, width :: Number): box-plot-chart-window(self.obj.{width: width}) end,
+  #  height: method(self, height :: Number): box-plot-chart-window(self.obj.{height: height}) end,
+  #  display: method(self):
+  #    _ = check-chart-window(self.obj)
+  #    self.obj.{interact: true}.render()
+  #  end,
+  #  get-image: method(self):
+  #    _ = check-chart-window(self.obj)
+  #    self.obj.{interact: false}.render()
+  #  end,
   | bar-chart-window(obj :: BarChartWindowObject) with:
-    constr: {(): bar-chart-window},
-    x-axis: method(self, x-axis :: String): self.constr()(self.obj.{x-axis: x-axis}) end,
-    y-axis: method(self, y-axis :: String): self.constr()(self.obj.{y-axis: y-axis}) end,
-    y-min: method(self, y-min :: Number): self.constr()(self.obj.{y-min: O.some(y-min)}) end,
-    y-max: method(self, y-max :: Number): self.constr()(self.obj.{y-max: O.some(y-max)}) end,
-sharing:
-  method display(self):
-    _ = check-chart-window(self.obj)
-    self.obj.{interact: true}.render()
-  end,
-  method get-image(self):
-    _ = check-chart-window(self.obj)
-    self.obj.{interact: false}.render()
-  end,
-  method title(self, title :: String):
-    self.constr()(self.obj.{title: title})
-  end,
-  method width(self, width :: Number):
-    self.constr()(self.obj.{width: width})
-  end,
-  method height(self, height :: Number):
-    self.constr()(self.obj.{height: height})
-  end,
+    x-axis: method(self, x-axis :: String): bar-chart-window(self.obj.{x-axis: x-axis}) end,
+    y-axis: method(self, y-axis :: String): bar-chart-window(self.obj.{y-axis: y-axis}) end,
+    y-min: method(self, y-min :: Number): bar-chart-window(self.obj.{y-min: O.some(y-min)}) end,
+    y-max: method(self, y-max :: Number): bar-chart-window(self.obj.{y-max: O.some(y-max)}) end,
+    title: method(self, title :: String): bar-chart-window(self.obj.{title: title}) end,
+    width: method(self, width :: Number): bar-chart-window(self.obj.{width: width}) end,
+    height: method(self, height :: Number): bar-chart-window(self.obj.{height: height}) end,
+    display: method(self):
+      _ = check-chart-window(self.obj)
+      self.obj.{interact: true}.render()
+    end,
+    get-image: method(self):
+      _ = check-chart-window(self.obj)
+      self.obj.{interact: false}.render()
+    end,
+  | histogram-chart-window(obj :: HistogramChartWindowObject) with:
+    x-axis: method(self, x-axis :: String): histogram-chart-window(self.obj.{x-axis: x-axis}) end,
+    y-axis: method(self, y-axis :: String): histogram-chart-window(self.obj.{y-axis: y-axis}) end,
+    x-min: method(self, x-min :: Number): histogram-chart-window(self.obj.{x-min: O.some(x-min)}) end,
+    x-max: method(self, x-max :: Number): histogram-chart-window(self.obj.{x-max: O.some(x-max)}) end,
+    y-max: method(self, y-max :: Number): histogram-chart-window(self.obj.{y-max: O.some(y-max)}) end,
+  | plot-chart-window(obj :: PlotChartWindowObject) with:
+    x-axis: method(self, x-axis :: String): plot-chart-window(self.obj.{x-axis: x-axis}) end,
+    y-axis: method(self, y-axis :: String): plot-chart-window(self.obj.{y-axis: y-axis}) end,
+    x-min: method(self, x-min :: Number): plot-chart-window(self.obj.{x-min: O.some(x-min)}) end,
+    x-max: method(self, x-max :: Number): plot-chart-window(self.obj.{x-max: O.some(x-max)}) end,
+    y-min: method(self, y-min :: Number): plot-chart-window(self.obj.{y-min: O.some(y-min)}) end,
+    y-max: method(self, y-max :: Number): plot-chart-window(self.obj.{y-max: O.some(y-max)}) end,
+    num-samples: method(self, num-samples :: Number) block:
+      when (num-samples <= 0) or (num-samples > 100000) or G.not(G.num-is-integer(num-samples)):
+        G.raise('num-samples: value must be an ineger between 1 and 100000')
+      end
+      plot-chart-window(self.obj.{num-samples: num-samples})
+    end,
+    title: method(self, title :: String): plot-chart-window(self.obj.{title: title}) end,
+    width: method(self, width :: Number): plot-chart-window(self.obj.{width: width}) end,
+    height: method(self, height :: Number): plot-chart-window(self.obj.{height: height}) end,
+    display: method(self):
+      _ = check-chart-window(self.obj)
+      self.obj.{interact: true}.render()
+    end,
+    get-image: method(self):
+      _ = check-chart-window(self.obj)
+      self.obj.{interact: false}.render()
+    end,
   # TODO(tiffany): add _output and test get-vs-from-img after VS is implemented
 end
 
@@ -187,6 +438,58 @@ end
 # FUNCTIONS
 ################################################################################
 
+fun function-plot-from-list(f :: PlottableFunction) -> DataSeries:
+  function-plot-series(default-function-plot-series.{
+    f: f,
+  })
+end
+
+fun line-plot-from-list(xs :: L.List<Number>, ys :: L.List<Number>) -> DataSeries block:
+  when L.length(xs) <> L.length(ys):
+    G.raise('line-plot: xs and ys should have the same length')
+  end
+  L.each(check-num, xs)
+  L.each(check-num, ys)
+  line-plot-series(default-line-plot-series.{
+    ps: L.map2({(x, y): [G.raw-array: x, y]}, xs, ys)
+  })
+end
+
+fun scatter-plot-from-list(xs :: L.List<Number>, ys :: L.List<Number>) -> DataSeries block:
+  when L.length(xs) <> L.length(ys):
+    G.raise('scatter-plot: xs and ys should have the same length')
+  end
+  L.each(check-num, xs)
+  L.each(check-num, ys)
+  scatter-plot-series(default-scatter-plot-series.{
+    ps: L.map2({(x, y): [G.raw-array: x, y]}, xs, ys)
+  })
+end
+
+# TODO(tiffany): implement labeled-scatter-plot-from-list
+
+# TODO(tiffany): implement exploding-pie-chart-from-list
+
+fun pie-chart-from-list(labels :: L.List<String>, values :: L.List<Number>) -> DataSeries block:
+  doc: ```
+       Consume labels, a list of string, and values, a list of numbers
+       and construct a pie chart
+       ```
+  label-length = L.length(labels)
+  value-length = L.length(values)
+  when label-length <> value-length:
+    G.raise('pie-chart: labels and values should have the same length')
+  end
+  when label-length == 0:
+    G.raise('pie-chart: need at least one data')
+  end
+  L.each(check-num, values)
+  L.each(check-string, labels)
+  pie-chart-series(default-pie-chart-series.{
+    tab: to-table2(labels, values)
+  })
+end
+
 fun bar-chart-from-list(labels :: L.List<String>, values :: L.List<Number>) -> DataSeries block:
   doc: ```
        Consume labels, a list of string, and values, a list of numbers
@@ -197,9 +500,8 @@ fun bar-chart-from-list(labels :: L.List<String>, values :: L.List<Number>) -> D
   when label-length <> value-length:
     G.raise('bar-chart: labels and values should have the same length')
   end
-  # TODO(tiffany): uncomment after implementing each
-  #values.each(check-num)
-  #labels.each(check-string)
+  L.each(check-num, values)
+  L.each(check-string, labels)
   bar-chart-series(default-bar-chart-series.{
     tab: to-table2(labels, values),
     legends: [G.raw-array: ''],
@@ -207,6 +509,26 @@ fun bar-chart-from-list(labels :: L.List<String>, values :: L.List<Number>) -> D
   })
 end
 
+# TODO(tiffany): implement grouped-bar-chart-from-list
+
+# TODO(tiffany): implement box-plot-from-list
+
+# TODO(tiffany): implement labeled-box-plot-from-list
+
+# TODO(tiffany): implement freq-bar-chart-from-list
+
+fun histogram-from-list(values :: L.List<Number>) -> DataSeries block:
+  doc: ```
+       Consume a list of numbers and construct a histogram
+       ```
+  L.each(check-num, values)
+  histogram-series(default-histogram-series.{
+    tab: to-table2(L.map({(_): ''}, values), values),
+  })
+end
+
+# TODO(tiffany): implement labeled-histogram-from-list
+
 ################################################################################
 # PLOTS
 ################################################################################
@@ -214,6 +536,14 @@ end
 fun render-chart(s :: DataSeries) -> ChartWindow:
   doc: 'Render it!'
   cases (DataSeries) s:
+    # TODO(tiffany): fix scatter-plot-series
+    | line-plot-series(_) => plot-chart-window(default-plot-chart-window-object)
+    | function-plot-series(_) => plot-chart-window(default-plot-chart-window-object)
+    | scatter-plot-series(_) => plot-chart-window(default-plot-chart-window-object)
+    | pie-chart-series(obj) =>
+      pie-chart-window(default-pie-chart-window-object.{
+        render: method(self): CL.pie-chart(obj.tab) end
+      })
     | bar-chart-series(obj) =>
       bar-chart-window(default-bar-chart-window-object.{
         render: method(self):
@@ -233,8 +563,62 @@ fun render-chart(s :: DataSeries) -> ChartWindow:
           CL.bar-chart(obj.tab)
         end
       })
+    # TODO(tiffany): implement CL.box-plot
+    # box-plot-series(obj) =>
+    #  box-plot-chart-window(default-box-plot-chart-window-object.{
+    #    render: method(self):
+    #      CL.box-plot(self, obj)
+    #    end
+    #  })
+    | histogram-series(obj) =>
+      histogram-chart-window(default-histogram-chart-window-object.{
+        render: method(self):
+          shadow self = self.{y-min: O.none}
+          _ = cases (Option) self.x-min:
+                | some(x-min) =>
+                  cases (Option) self.x-max:
+                    | some(x-max) =>
+                      if x-min >= x-max:
+                        G.raise("render: x-min must be strictly less than x-max")
+                      else:
+                        G.nothing
+                      end
+                    | else => G.nothing
+                  end
+                | else => G.nothing
+              end
+          _ = cases (Option) self.y-min:
+                | some(y-min) =>
+                  cases (Option) self.y-max:
+                    | some(y-max) =>
+                      if y-min >= y-max:
+                        G.raise("render: y-min must be strictly less than y-max")
+                      else:
+                        G.nothing
+                      end
+                    | else => G.nothing
+                  end
+                | else => G.nothing
+              end
+          CL.histogram(obj.tab)
+        end
+      })
   end
 #where:
 #  render-now = {(x): render-chart(x).get-image()}
 end
 
+
+# TODO(tiffany): implement inbound-x
+
+# TODO(tiffany): implement inbound-y
+
+# TODO(tiffany): implement inbound-xy
+
+# TODO(tiffany): implement dist
+
+# TODO(tiffany): implement nearest
+
+# TODO(tiffany): implement find-pt-on-edge
+
+# TODO(tiffany): implement line-plot-edge-cut
diff --git a/src/runtime/chart-lib.arr.js b/src/runtime/chart-lib.arr.js
index fb4f7fd42e..6ff0800a46 100644
--- a/src/runtime/chart-lib.arr.js
+++ b/src/runtime/chart-lib.arr.js
@@ -20,7 +20,6 @@ function checkColor(val) {
 /* @stopify flat */
 function barChart(tableFromRawArray) {
     headers = ["",""];
-
     return {
         "$brand": "chart",
         "chartType": "BarChart",
@@ -39,6 +38,16 @@ function barChartFromTable(table) {
     };
 }
 
+/* @stopify flat */
+function pieChart(tableFromRawArray) {
+    return {
+        "$brand": "chart",
+        "chartType": "PieChart",
+        "_headers": ["",""],
+        "_rows": tableFromRawArray
+    };
+}
+
 /* @stopify flat */
 function pieChartFromTable(table) {
     return {
@@ -49,6 +58,16 @@ function pieChartFromTable(table) {
     };
 }
 
+/* @stopify flat */
+function histogram(tableFromRawArray) {
+    return {
+        "$brand": "chart",
+        "chartType": "Histogram",
+        "_headers": ["",""],
+        "_rows": tableFromRawArray
+    };
+}
+
 /* @stopify flat */
 function histogramFromTable(table) {
     return {
@@ -89,9 +108,15 @@ return module.exports = {
     "bar-chart-from-table": /* @stopify flat */ function (table) {
         return barChartFromTable(table);
     },
+    "pie-chart": /* @stopify flat */ function (tableFromRawArray) {
+        return pieChart(tableFromRawArray);
+    },
     "pie-chart-from-table": /* @stopify flat */ function (table) {
         return pieChartFromTable(table);
     },
+    "histogram": /* @stopify flat */ function (tableFromRawArray) {
+        return histogram(tableFromRawArray);
+    },
     "histogram-from-table": /* @stopify flat */ function (table) {
         return histogramFromTable(table);
     },
diff --git a/src/runtime/chart-lib.arr.json b/src/runtime/chart-lib.arr.json
index ef0ec1aa29..123f8ef891 100644
--- a/src/runtime/chart-lib.arr.json
+++ b/src/runtime/chart-lib.arr.json
@@ -19,7 +19,9 @@
             "check-color": ["arrow", ["Any"], "Any"],
             "bar-chart": ["arrow", ["rOfR"], "Chart"],
             "bar-chart-from-table": ["arrow", ["Table"], "Chart"],
+            "pie-chart": ["arrow", ["rOfR"], "Chart"],
             "pie-chart-from-table": ["arrow", ["Table"], "Chart"],
+            "histogram": ["arrow", ["rOfR"], "Chart"],
             "histogram-from-table": ["arrow", ["Table"], "Chart"],
             "scatter-chart-from-table": ["arrow", ["Table"], "Chart"],
             "line-chart-from-table": ["arrow", ["Table"], "Chart"]
diff --git a/src/runtime/list.arr.js b/src/runtime/list.arr.js
index 13a6c7271b..61a63a8348 100644
--- a/src/runtime/list.arr.js
+++ b/src/runtime/list.arr.js
@@ -20,6 +20,11 @@ module.exports = {
     }
     return arr;
   },
+  'each': function( fun, lst ) {
+    for (let i = 0; i < lst.length; i++) {
+      lst[i] = fun(lst[i]);
+    }
+  },
   'map': function( fun, list ) {
     return list.map( fun );
   },
diff --git a/src/runtime/list.arr.json b/src/runtime/list.arr.json
index 2eea1cc2be..2dbb99e5a7 100644
--- a/src/runtime/list.arr.json
+++ b/src/runtime/list.arr.json
@@ -21,6 +21,7 @@
       "length": ["forall", ["a"], ["arrow", ["lOfA"], "Number"]],
       "contains": ["forall", ["a"], ["arrow", ["lOfA", "tva"], "Boolean"]],
       "to-raw-array": ["forall", ["a"], ["arrow", ["lOfA"], "rOfA"]],
+      "each": ["forall", ["a"], ["arrow", [["arrow", ["tva"], "Nothing"], "lOfA"], "Nothing"]],
       "map": ["forall", ["a", "b"], ["arrow", [["arrow", ["tva"], "tvb"], "lOfA"], "lOfB"]],
       "map2": ["forall", ["a", "b", "c"], ["arrow", [["arrow", ["tva", "tvb"], "tvc"], "lOfA", "lOfB"], "lOfC"]],
       "map3": ["forall", ["a", "b", "c", "d"], ["arrow", [["arrow", ["tva", "tvb", "tvc"], "tvd"], "lOfA", "lOfB", "lOfC"], "lOfD"]],