How to use spread operator in the array and assign the previous value?-CodePudding

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How to use spread operator in the array and assign the previous value?

Time：02-11

const arr = [1,2,3];

I want to have [1,2,3,4,5,6] using:

const arr1 = [4,5,6];

If the array is too large it takes time to use

const arr2 = [...arr, ...arr1]

How do we achieve this in JavaScript

CodePudding user response：

It could be done using the array syntax, which is faster?

const arr = [1,2,3]

const arr2 = [4,5,6]


const arr3 = _.union(arr, arr2)

console.log(arr3)

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