feat: add split function

package.json

@@ -7,7 +7,7 @@
     "analyze": "yarn build --json | tac | tac | tail -n +3 > stats.json",
     "analyze-bundle":
       "yarn analyze && yarn webpack-bundle-analyzer stats.json lib/",
-    "test": "jest src",
+    "test": "jest ./src",
     "build": "yarn webpack && yarn babel src/ -d lib/",
     "test:eslint": "yarn eslint src",
     "test:flow": "yarn flow check",

src/__tests__/builtins.test.js

@@ -12,7 +12,8 @@ const {
   reduce,
   length,
   keys,
-  values,
+  split,
+  values
 } = builtIns
 
 describe('built ins', () => {
@@ -50,6 +51,13 @@ describe('built ins', () => {
     })
   })
 
+  describe('split', () => {
+    it('returns correct value', () => {
+      expect(split(' ')('Hello World')).toEqual(['Hello', 'World'])
+      expect(split(',')('Hello World')).toEqual(['Hello World'])
+    })
+  })
+
   describe('map', () => {
     it('returns correct value', () => {
       const id = a => a; // eslint-disable-line

src/builtins.js

@@ -39,6 +39,10 @@ export default {
       ? handleProjection(left)(right)[0]
       : handleProjection(left)(right),
 
+  split: (separator: string): (string => Array<string>) => (
+    input: string
+  ): Array<string> => input.split(separator),
+
   join: (separator: string): ((Array<string>) => string) => (
     input: Array<string>
   ): string => input.join(separator),