I would like to merge 2 arrays with a different length:
let array1 = ["a", "b", "c", "d"];
let array2 = [1, 2];
The outcome I would expect is ["a", 1 ,"b", 2, "c", "d"]
What's the best way to do that?
You could iterate the min length of both array and build alternate elements and at the end push the rest.
var array1 = [a, b, c, d],
array2 = [1, 2],
result = [],
i, l = Math.min(array1.length, array2.length);
for (i = 0; i < l; i++) {
result.push(array1[i], array2[i]);
}
result.push(...array1.slice(l), ...array2.slice(l));
console.log(result);Solution for an arbitrary count of arrays with a transposing algorithm and later flattening.
var array1 = [a, b, c, d],
array2 = [1, 2],
result = [array1, array2]
.reduce((r, a) => (a.forEach((a, i) => (r[i] = r[i] || []).push(a)), r), [])
.reduce((a, b) => a.concat(b));
console.log(result);
