In JavaScript, I have an array, which is

array = [true, false]

In some cases, I am trying to initialize this array

array.map(item => {

   item = false

})

After running the above code, the array is not changed, it is still [true, false], so is .map not reliable sometimes?

ONE MORE QUESTION:
After running my below code, the array is changed. Why does it work in this case?

let array = [{id:1, checked: false}, {id:2, checked:true}]

array.map(item => {

    item.checked = true

})

array becomes [{id:1, checked: true}, {id:2, checked:true}]