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

If using a complex object (or even a simple one) and you can use es6, Array.prototype.findIndex is a good one. For the OP's array, they could do,

const index = items.findIndex(x => x === 3452)
items[index] = 1010

For more complex objects, this really shines. For example,

const index = 
    items.findIndex(
       x => x.jerseyNumber === 9 && x.school === 'Ohio State'
    )

items[index].lastName = 'Utah'
items[index].firstName = 'Johnny'