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I like to combine numbers at every 4th index of an array. In the following oversimplified example, I did using "for" loop. Instead of that, I like to learn how to use "map" to achieve the same result. Thanks for any help!
function test() {
var array = [1, 2, 3, 4, 5, 6, 7, 8], arrayNew = [];
for (var n = 0; n < 4; ++n)
arrayNew[n] = array[n] + array[n + 4];
console.log(arrayNew)
}
>Solution :
To use .map
, you could iterate the slice of the array that omits the first four elements. During that iteration, the loop index will be 4 units less, so you can grab array[i]
and combine it with the currently iterated value from the slice:
const array = [1, 2, 3, 4, 5, 6, 7, 8];
const result = array.slice(4).map((val, i) => array[i] + val);
console.log(result);