is-what

What is is-what?

The is-what npm package provides utility functions to check the type of a given value. It helps in determining whether a value is an object, array, function, string, number, etc. This can be particularly useful in type-checking scenarios and ensuring that values conform to expected types.

What are is-what's main functionalities?

isObject

The isObject function checks if a given value is a plain object. It returns true for plain objects and false for arrays and other types.

const { isObject } = require('is-what');
console.log(isObject({})); // true
console.log(isObject([])); // false

isArray

The isArray function checks if a given value is an array. It returns true for arrays and false for other types.

const { isArray } = require('is-what');
console.log(isArray([])); // true
console.log(isArray({})); // false

isFunction

The isFunction function checks if a given value is a function. It returns true for functions and false for other types.

const { isFunction } = require('is-what');
console.log(isFunction(function() {})); // true
console.log(isFunction({})); // false

isString

The isString function checks if a given value is a string. It returns true for strings and false for other types.

const { isString } = require('is-what');
console.log(isString('hello')); // true
console.log(isString(123)); // false

isNumber

The isNumber function checks if a given value is a number. It returns true for numbers and false for other types.

const { isNumber } = require('is-what');
console.log(isNumber(123)); // true
console.log(isNumber('123')); // false

Other packages similar to is-what

lodash

Lodash is a popular utility library that provides a wide range of functions for manipulating arrays, objects, and other types. It includes type-checking functions similar to is-what, such as _.isObject, _.isArray, _.isFunction, _.isString, and _.isNumber. Lodash offers more comprehensive functionality beyond type-checking.

underscore

Underscore is another utility library that provides functional programming helpers for working with arrays, objects, and other types. It includes type-checking functions like _.isObject, _.isArray, _.isFunction, _.isString, and _.isNumber. Underscore is similar to Lodash but with a smaller footprint and fewer features.

type-detect

Type-detect is a simple library for detecting the type of a given value. It provides functions like typeDetect(value) which returns a string representing the type of the value. While it offers similar functionality to is-what, it focuses on returning type names rather than boolean checks.

README

isWhat

Very simple & small JS type check function

It's litterally just these functions:

function getType (payload) {
  return Object.prototype.toString.call(payload).slice(8, -1)
}
function isUndefined (payload) {
  return getType(payload) === 'Undefined'
}
function isNull (payload) {
  return getType(payload) === 'Null'
}
function isObject (payload) {
  return getType(payload) === 'Object'
}
function isArray (payload) {
  return getType(payload) === 'Array'
}
function isString (payload) {
  return getType(payload) === 'String'
}
function isNumber (payload) {
  return getType(payload) === 'Number'
}
function isBoolean (payload) {
  return getType(payload) === 'Boolean'
}
function isRegExp (payload) {
  return getType(payload) === 'RegExp'
}
function isDate (payload) {
  return getType(payload) === 'Date'
}

Build from source

npm run build