Is there a way to concatenate two arrays in JavaScript, where the second array appears before the first?
For example:
const arr1 = [1, 2, 3];
const arr2 = [4, 5, 6];
const combinedArr = arr1.concat(arr2);
console.log(combinedArr);I am aware that you could simply switch arr1 with arr2 and reverse the order arr2.concat(arr1), but I am curious if there is a more efficient or alternative method of achieving this.
For those utilizing ES6, incorporating the spread operator can be beneficial: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Spread_operator
[ ...arr2, ...arr1 ]
One option to consider is using the unshift method: arr1.unshift(arr2);
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