currying.js

function changeValue(arr) {
    return function fromIndex(arrIndex) {
        return function withValue(newValue) {
            return arr.map(function(arr, index){
                if (index == arrIndex) {
                    return newValue
                }
                return arr
            })
        }
    }
}
const changeValue = arr => arrIndex => newValue => {
    return arr.map((arr, index) => {
        if (index == arrIndex) {
            return newValue
        }
        return arr
    })
}

var array = [2,3,5]
var newArray = changeValue(array)(0)(7)
console.log(newArray);