immutability-helper test

const update = require("immutability-helper") let obj1 = {a:[1]}; let obj2 = {a:[1]}; obj1.a === obj2.a

const newArr = [3]; const obj1e1 = update(obj1, {c: {$set: newArr}}) obj1.a === obj1e1.a

obj1 === obj1e1

newArr.push(2); let obj3 = {c:newArr}; obj3.c === obj1e1.c