The answer
Presetting arguments: const add5 = add.bind(null, 5) creates a function where the first arg is always 5.
call, apply, and bind in JavaScript Explained
What is partial application with bind?
More FAQs in call, apply, and bind in JavaScript Explained
call and apply invoke immediately (call takes comma args, apply takes an array). bind returns a new function with this permanently bound, to be called later.
Use Array.prototype.slice.call(arguments) to borrow slice and convert the array-like arguments to a real array.
No. Arrow functions inherit this lexically. call, apply, and bind cannot change an arrow's this.
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