SOURCE

function makeClosures(arr, fn) {
    var result = []
    for (let i = 0; i < arr.length; i++) {
        var a = fn(arr[i])
        result.push(a)
    }
    return result
}
var abc = makeClosures([1, 2, 3], function (x) {
    return x * x;
})
console.log(abc[1])