concat vs spread

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concat
const arr1 = [1,2,3,4,5];
const arr2 = [6,7,8,9,10];
const newArr = arr1.concat(arr2);
ready
spread
const arr1 = [1,2,3,4,5];
const arr2 = [6,7,8,9,10];
const newArr = [...arr1, ...arr2];
ready
push
const arr1 = [1,2,3,4,5];
const arr2 = [6,7,8,9,10];
const newArr = []
newArr.push(...arr1,...arr2);
ready
flat
const arr1 = [1,2,3,4,5];
const arr2 = [6,7,8,9,10];
const newArr = [arr1,arr2].flat();
ready

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