The answer
When you need a function with this permanently bound for later use, like callbacks (setTimeout, event listeners) where this would otherwise be lost.
call vs apply vs bind: Detailed Comparison
When should you use bind in JavaScript?
More FAQs in call vs apply vs bind: Detailed Comparison
Use call when you have individual arguments. Use apply when you have arguments in an array. With spread syntax, call with ...args works too, making apply less necessary in modern JS.
No. bind returns a new function with this bound. You must call it separately: const bound = fn.bind(obj); bound(). Re-binding a bound function has no effect on this.
Yes. func.apply(null, args) is equivalent to func.call(null, ...args) with spread. This makes apply less necessary in modern JS, but it is still useful for older codebases.
Still have questions?
Browse all our FAQs or reach out to our support team
Want to upskill yourself?
Your learning library
Small steps. Big possibilities.
Find your next course. Build something great.