How to bind function arguments without binding this?

Question

In Javascript, how can I bind arguments to a function without binding the this parameter?

For example:

//Example function.
var c = funct         


        

Answer 1

In ES6, this is easily done using rest parameters in conjunction with the spread operator.

So we can define a function bindArgs that works like bind, except that only arguments are bound, but not the context (this).

Function.prototype.bindArgs =
    function (...boundArgs)
    {
        const targetFunction = this;
        return function (...args) { return targetFunction.call(this, ...boundArgs, ...args); };
    };

Then, for a specified function foo and an object obj, the statement

return foo.call(obj, 1, 2, 3, 4);

is equivalent to

let bar = foo.bindArgs(1, 2);
return bar.call(obj, 3, 4);

where only the first and second arguments are bound to bar, while the context obj specified in the invocation is used and extra arguments are appended after the bound arguments. The return value is simply forwarded.