prelude-js

A standard module for functional programming in JavaScript.

What

A minimalist collection of functions to support functional programming.

For example, it includes the following:

• Method of object as function.

  If you wanted to apply trim to all elements of a string[], you would do something like this:

  const runtime = [" deno ", " node.js"].map((v) => v.trim());

  Use string#trim.

  import { trim } from "https://deno.land/x/prelude_js@$VERSION/mod.ts";
  const runtime = [" deno ", " node.js"].map(trim);

Method as function

Methods are provided as functions from any objects.

The independence of methods as functions is convenient for functional programming.

unary

Property is provided as unary.

• constructor
• description
• length

multiary

Method is provided as a multiary.

• at
• charAt
• charCodeAt
• codePointAt
• concat
• indexOf
• lastIndexOf
• localeCompare
• match
• search
• slice
• split
• substring
• toLowerCase
• toLocaleLowerCase
• toUpperCase
• toLocaleUpperCase
• trim
• valueOf
• trimStart
• trimEnd
• toFixed
• toExponential
• toPrecision
• toString
• toLocaleString

List

A list in this project refers to an Iterable object.

Head

Take head(first) element from list.

import { head } from "https://deno.land/x/prelude_js@$VERSION/mod.ts";
import { assertEquals } from "https://deno.land/std@$VERSION/testing/asserts.ts";

assertEquals(head(""), undefined);
assertEquals(head("abcd"), "a");
assertEquals(head([]), undefined);
assertEquals(head([1, 2, 3]), 1);

Record

Record in this project refers to Record types.

prop

Take property from record.

import { prop } from "https://deno.land/x/prelude_js@$VERSION/mod.ts";
import { assertEquals } from "https://deno.land/std@$VERSION/testing/asserts.ts";

assertEquals(prop("value")({ value: 123 }), 123);

License

Copyright © 2022-present TomokiMiyauci.

Released under the MIT license