Return to Answer

Post Timeline

Active reading.

Source Link

edited Aug 13, 2021 at 14:23

reputation score 30948
22
22 gold badges
111
111 silver badges
134
134 bronze badges

Taking profit of reducethe reduce method as followingfollows:

function insert(arr, val, index) {
    return index >= arr.length 
        ? arr.concat(val)
        : arr.reduce((prev, x, i) => prev.concat(i === index ? [val, x] : x), []);
}

So atin this way we can return a new array (will be a cool functional way - more much better than use pushusing push or splicesplice) with the element inserted at index, and if the index is greater than the length of the array it will be inserted at the end.

Taking profit of reduce method as following:

function insert(arr, val, index) {
    return index >= arr.length 
        ? arr.concat(val)
        : arr.reduce((prev, x, i) => prev.concat(i === index ? [val, x] : x), []);
}

So at this way we can return a new array (will be a cool functional way - more much better than use push or splice) with the element inserted at index, and if the index is greater than the length of the array it will be inserted at the end.

Taking profit of the reduce method as follows:

function insert(arr, val, index) {
    return index >= arr.length
        ? arr.concat(val)
        : arr.reduce((prev, x, i) => prev.concat(i === index ? [val, x] : x), []);
}

So in this way we can return a new array (will be a cool functional way - more much better than using push or splice) with the element inserted at index, and if the index is greater than the length of the array it will be inserted at the end.

Source Link

answered Jan 12, 2019 at 17:04

alejoko

reputation score 1150
9
9 silver badges
15
15 bronze badges

Taking profit of reduce method as following:

function insert(arr, val, index) {
    return index >= arr.length 
        ? arr.concat(val)
        : arr.reduce((prev, x, i) => prev.concat(i === index ? [val, x] : x), []);
}

Collectives™ on Stack Overflow