The answer
const add5 = add.bind(null, 5) creates a function where the first argument is always 5. When called with (3, 2), it calls add(5, 3, 2). This is partial application.
Practical Use Cases for call, apply, and bind
How do you use bind for partial application in JavaScript?
More FAQs in Practical Use Cases for call, apply, and bind
Use call: Array.prototype.slice.call(arguments) borrows slice to convert array-like objects to arrays. Array.prototype.forEach.call(nodeList, fn) borrows forEach for NodeLists.
Use bind: setTimeout(obj.method.bind(obj), 1000). Or use an arrow wrapper: setTimeout(() => obj.method(), 1000). bind permanently sets this for the returned function.
Math.max.apply(null, [1, 2, 3]) returns 3. In modern JS, use spread: Math.max(...[1, 2, 3]). Both work, but spread is more readable.
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.