mewt

Install

npm install --save mewt

yarn add mewt

Import

// ES2015importimmutablefrom'mewt'

// CommonJSvarimmutable=require('mewt')

Usage

constimmutableArray=immutable([])constimmutableObject=immutable({})immutableArray[0]='Van Morrison'//=> Error "array is immutable"immutableObject.name='Van Morrison'//=> Error "object is immutable"

Array

constarr=immutable([])// 1. all array instance methods are availableconstarr1=arr.concat('bubble')console.log(arr1)//=> ['bubble']console.log(arr1===arr)//=> false// 2. methods with non-array return value (push, pop, shift, unshift)// also return new array, accessible via destructuringconst[val,arr2]=arr1.pop()console.log(val)//=> 'bubble'console.log(arr2)//=> []console.log(arr2===arr1)//=> false// 3. use $set and $unset to get new array with changesconstarr3=arr2.$set(0,'Iggy Pop')console.log(arr3)//=> ['Iggy Pop']console.log(arr3===arr2)//=> false

Object

constobj=immutable({})// 1. properties are added/updated using `$set`constobj1=obj.$set('album','Hunky Dory')console.log(obj1)//=> {album: 'Hunky Dory'}console.log(obj1===obj)//=> false// 2. properties are deleted using `$unset`constobj2=obj1.$unset('album')console.log(obj2)//=> {}console.log(obj2===obj1)//=> false

Contributors

Contributing