nukit

Tiny collection of essential JavaScript utilities.

Usage

Install:

npm i nukit

Import:

import { isNumber, oneOf, pick } from 'nukit';

if (oneOf([null, 'foo', 42], isNumber)) {
  console.log('There is a number!');
}

const value = pick(['apple', 'banana', 'carrot']);

Why?

• TypeScript: nice types support
• Small & Simple: 37 essential functions in about 5 KBs of code
• Modern: doesn't rewrites ESNext features that already exists

Contents

Filters

• isUndefined — returns true if value is undefined
• isNull — returns true if value is null
• isBoolean — returns true if value is a boolean
• isNumber — returns true if value is a number
• isString — returns true if value is a string
• isPrimitive — returns true if value is a primitive, i.e. undefined, null, boolean, number or string
• isArray — returns true if value is array of any items
• isObject — returns true if value is an object but not null nor array
• isEmpty — returns true if value is empty, i.e. undefined, null, empty string, empty array or empty object (i.e. object without own properties)
• allOf — returns true if all values in array meets filter condition
• oneOf — returns true if at least one of values in array meets filter condition
• equally — returns true if all of predicates are true
  • and — alias
• neither — returns true if at least one of predicates is true
  • or — alias
• toUnique — creates a predicate function for standard Array.prototype.filter to filter unique values

Mappers

• toBoolean — maps value into a boolean if possible
• toNumber — maps value into a number if possible
• toString — maps value into a string
• filterObject — filters object entries by predicate like standard array's filter
• mapObject — maps object entries by callback function like standard array's map
• repeat — repeats some action for a specified number of times
• byKeys — creates a comparator function for standard array's sort method to sort elements by keys provided in a custom order

Random

• bool — returns random boolean value
• int — returns random integer number value
• float — returns random float number value
• char — returns random character value
• str — returns random string value
• pick — returns random value from an array of one or more items
• shuffle — returns shuffled copy of array
• weighted — returns weighted random value from an array of values and weights

Seedable Random

Just like random utilities above, but with seeding support.

• seedBool — creates seeded version of bool function
• seedInt — creates seeded version of char function
• seedFloat — creates seeded version of float function
• seedChar — creates seeded version of char function
• seedStr — creates seeded version of str function
• seedPick — creates seeded version of pick function
• seedShuffle — creates seeded version of shuffle function
• seedWeighted — creates seeded version of weighted function

Date

• ts — returns a Unix numeric timestamp for current or specified date
• isValidDate — returns true if value is valid Date or suits for Date creation
• diffDate — returns total amount of time between two dates (years, months, days, hours etc)

Error

• when/drop — returns a function to drop an error when predicate is true

RegExp

• r — creates a RegExp from a template string, gu flags are enabled
• re — creates a RegExp from a string in a short way

Development

# run tests
npm run test

# get tests coverage report
npm run coverage

# build a package
npm run build

# publish a release
npm run release