🏷 Added Typescript

src/index.ts

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+
+export function arraySome<T>(arr: T[], fn: (element: T, index: number, array: T[]) => boolean, thisArg: any = arr) {
+  fn = fn.bind(thisArg)
+  return arr.reduce((carry, item, index, arr) => {
+    return Boolean(fn(item, index, arr)) || carry
+  }, false)
+}
+
+export function arrayEvery<T>(arr: T[], fn: (element: T, index: number, array: T[]) => boolean, thisArg: any = arr) {
+  fn = fn.bind(thisArg)
+  return arr.reduce((carry, item, index, array) => {
+    return Boolean(fn(item, index, array)) && carry
+  }, true)
+}
+export function arrayMap<T, U>(arr: T[], fn: (element: T, index: number, array: T[]) => U, thisArg: any = arr) {
+  fn = fn.bind(thisArg)
+  return arr.reduce((carry, item, index, array) => {
+    carry.push(fn(item, index, array))
+    return carry;
+  }, [] as U[])
+}
+
+export function arrayForEach<T>(arr: T[], fn: (element: T, index: number, array: T[]) => void, thisArg: any = arr) {
+  fn = fn.bind(thisArg)
+  arr.reduce((_, item, index, array) => {
+    fn(item, index, array)
+    return _ // typescript needs this cos it big dumb dumb (or I big dumb dumb)
+  }, undefined)
+}
+
+export function arrayIncludes<T>(arr: T[], needle: T, fromIndex = 0) {
+  return arraySome(arr, (item, index) => {
+    if (index < fromIndex) return false
+    if (isNaN(item as any) && isNaN(needle as any)) {
+      return true
+    }
+    return item === needle
+  })
+}
+
+export function arraySlice<T>(array: T[], start = 0, stop = Infinity) {
+  start = (array.length + (start % array.length))
+  stop = Math.abs(stop) === Infinity ? stop : (array.length + (stop % array.length))
+
+  return array.reduce((carry, item, index) => {
+    if (index >= start && index <= stop) {
+      carry.push(item)
+    }
+    return carry
+  }, [] as T[])
+}
+
+export function arrayFlat<T>(array: (T | T[])[], depth = 1): (T | T[])[] {
+  return array.reduce((output, item) => {
+    if (Array.isArray(item) && depth >= 1) {
+      output.push(...arrayFlat(item, depth - 1))
+    } else {
+      output.push(item)
+    }
+    return output
+  }, [] as (T | T[])[])
+}
+
+export function arrayFlatMap<T, U>(array: T[], mapFn: (element: T, index: number, array: T[]) => U | U[], thisArg: any = array): U[] {
+  mapFn = mapFn.bind(thisArg)
+  return array.reduce((output, item, index, array) => {
+    const result = mapFn(item, index, array)
+    if (Array.isArray(result)) {
+      output.push(...result)
+    } else {
+      output.push(result)
+    }
+    return output
+  }, [] as U[])
+}
+
+export function arrayZip<T>(arrGroup: T[][]) {
+  const maxLength = arrGroup.reduce((max, arr) => Math.max(max, arr.length), 0)
+
+  return Array.from({
+    length: maxLength
+  },
+    (_, index) => index)
+    .reduce((carry, index) => {
+      carry.push(
+        arrGroup
+          .reduce((acc, arr) => {
+            acc.push(arr[index])
+            return acc
+          }, [] as any[])
+      )
+      return carry
+    }, [] as any[])
+}
+
+// Bonus
+// export const arrayIntersection = (arrGroup) => arrGroup.reduce((item, index) => index ? item : arrayFilter(item, item => arrayEvery(arraySlice(arrGroupitem, 1), (internalArray) => arrayIncludes(internalArray, item)), null))
+export function arrayUnion<T>(arrGroup: T[][]) {
+  return [
+    ...arrGroup.reduce(
+      (carry, arr) => arrayForEach(arr, (item) => carry.add(item)) as undefined || carry,
+      new Set<any>()
+    )
+  ]
+}

tsconfig.json

@@ -0,0 +1,75 @@
+{
+  "compilerOptions": {
+    /* Basic Options */
+    // "incremental": true,                   /* Enable incremental compilation */
+    "target": "es2015",
+    /* Specify ECMAScript target version: 'ES3' (default), 'ES5', 'ES2015', 'ES2016', 'ES2017', 'ES2018', 'ES2019' or 'ESNEXT'. */
+    "module": "commonjs",
+    /* Specify module code generation: 'none', 'commonjs', 'amd', 'system', 'umd', 'es2015', or 'ESNext'. */
+    "lib": ["es5", "es6", "es7", "es2018"],
+    /* Specify library files to be included in the compilation. */
+    // "allowJs": true,                       /* Allow javascript files to be compiled. */
+    // "checkJs": true,                       /* Report errors in .js files. */
+    // "jsx": "preserve",                     /* Specify JSX code generation: 'preserve', 'react-native', or 'react'. */
+    "declaration": true,
+    /* Generates corresponding '.d.ts' file. */
+    "declarationMap": true,
+    /* Generates a sourcemap for each corresponding '.d.ts' file. */
+    "sourceMap": true,
+    /* Generates corresponding '.map' file. */
+    // "outFile": "./",                       /* Concatenate and emit output to single file. */
+    "outDir": "./dist",
+    /* Redirect output structure to the directory. */
+    // "rootDir": "./",                       /* Specify the root directory of input files. Use to control the output directory structure with --outDir. */
+    // "composite": true,                     /* Enable project compilation */
+    // "tsBuildInfoFile": "./",               /* Specify file to store incremental compilation information */
+    // "removeComments": true,                /* Do not emit comments to output. */
+    // "noEmit": true,                        /* Do not emit outputs. */
+    // "importHelpers": true,                 /* Import emit helpers from 'tslib'. */
+    // "downlevelIteration": true,            /* Provide full support for iterables in 'for-of', spread, and destructuring when targeting 'ES5' or 'ES3'. */
+    // "isolatedModules": true,               /* Transpile each file as a separate module (similar to 'ts.transpileModule'). */
+
+    /* Strict Type-Checking Options */
+    "strict": true,
+    /* Enable all strict type-checking options. */
+    // "noImplicitAny": true,                 /* Raise error on expressions and declarations with an implied 'any' type. */
+    // "strictNullChecks": true,              /* Enable strict null checks. */
+    // "strictFunctionTypes": true,           /* Enable strict checking of function types. */
+    // "strictBindCallApply": true,           /* Enable strict 'bind', 'call', and 'apply' methods on functions. */
+    // "strictPropertyInitialization": true,  /* Enable strict checking of property initialization in classes. */
+    // "noImplicitThis": true,                /* Raise error on 'this' expressions with an implied 'any' type. */
+    // "alwaysStrict": true,                  /* Parse in strict mode and emit "use strict" for each source file. */
+
+    /* Additional Checks */
+    // "noUnusedLocals": true,                /* Report errors on unused locals. */
+    // "noUnusedParameters": true,            /* Report errors on unused parameters. */
+    // "noImplicitReturns": true,             /* Report error when not all code paths in function return a value. */
+    // "noFallthroughCasesInSwitch": true,    /* Report errors for fallthrough cases in switch statement. */
+
+    /* Module Resolution Options */
+    // "moduleResolution": "node",            /* Specify module resolution strategy: 'node' (Node.js) or 'classic' (TypeScript pre-1.6). */
+    // "baseUrl": "./",                       /* Base directory to resolve non-absolute module names. */
+    // "paths": {},                           /* A series of entries which re-map imports to lookup locations relative to the 'baseUrl'. */
+    // "rootDirs": [],                        /* List of root folders whose combined content represents the structure of the project at runtime. */
+    // "typeRoots": [],                       /* List of folders to include type definitions from. */
+    // "types": [],                           /* Type declaration files to be included in compilation. */
+    // "allowSyntheticDefaultImports": true,  /* Allow default imports from modules with no default export. This does not affect code emit, just typechecking. */
+    "esModuleInterop": true,
+    /* Enables emit interoperability between CommonJS and ES Modules via creation of namespace objects for all imports. Implies 'allowSyntheticDefaultImports'. */
+    // "preserveSymlinks": true,              /* Do not resolve the real path of symlinks. */
+    // "allowUmdGlobalAccess": true,          /* Allow accessing UMD globals from modules. */
+
+    /* Source Map Options */
+    // "sourceRoot": "",                      /* Specify the location where debugger should locate TypeScript files instead of source locations. */
+    // "mapRoot": "",                         /* Specify the location where debugger should locate map files instead of generated locations. */
+    // "inlineSourceMap": true,               /* Emit a single file with source maps instead of having a separate file. */
+    // "inlineSources": true,                 /* Emit the source alongside the sourcemaps within a single file; requires '--inlineSourceMap' or '--sourceMap' to be set. */
+
+    /* Experimental Options */
+    // "experimentalDecorators": true,        /* Enables experimental support for ES7 decorators. */
+    // "emitDecoratorMetadata": true,         /* Enables experimental support for emitting type metadata for decorators. */
+
+    /* Advanced Options */
+    "forceConsistentCasingInFileNames": true /* Disallow inconsistently-cased references to the same file. */
+  }
+}