Use map to accept an additional argument in javascript
Problem
Write a function Array.prototype.map() which can accept one additional argument.
function mul(x) {
return x * x;
}
console.log([1, 2, 3].map(mul)); // [1, 4, 9]
Modify the function so that it can accept an additional argument
var mulWAdjustment = function(x, variance) {
return (x * x + variance);
}
This post is a follow-up of
- Closures JavaScript interview question
I recommend reading it first, as it covers the basics of closures.
Logic 1
- Using
bind. - The first argument to the bind sets the context, which we do not need to set in this case.
- The second argument to the bind is passed as the first argument to the callback, which we can use as an additional argument.
Logic 2
- Using
callbacks. - First argument to the map returns a callback function which accepts one argument. But it also has the access to the variance in the closures.