How to replace an item in an array with JavaScript?

Question

Each item of this array is some number.

var items = Array(523,3452,334,31, ...5346);

How do I replace some number in with array with a new on

Answer 1

var items = Array(523,3452,334,31,5346);

If you know the value then use,

items[items.indexOf(334)] = 1010;

If you want to know that value is present or not, then use,

var point = items.indexOf(334);

if (point !== -1) {
    items[point] = 1010;
}

If you know the place (position) then directly use,

items[--position] = 1010;

If you want replace few elements, and you know only starting position only means,

items.splice(2, 1, 1010, 1220);

for more about .splice