call, apply, and bind Best Practices
Best practices for using call, apply, and bind in modern JavaScript.
call, apply, and bind Best Practices
1. Prefer Spread Over apply
// old: Math.max.apply(null, arr) // new: Math.max(...arr)
2. Prefer Arrow Functions Over bind for Callbacks
// old: setTimeout(obj.method.bind(obj), 1000) // new: setTimeout(() => obj.method(), 1000)
3. Use bind for Permanent Binding
class Person { constructor() { this.greet = this.greet.bind(this); } greet() { console.log(this.name); } }
4. Use call for Method Borrowing
Array.prototype.slice.call(arguments);
5. Avoid Using call/apply for Normal Invocation
// avoid: fn.call(null, arg) // prefer: fn(arg)
The Takeaway
Best practices: prefer spread over apply, prefer arrow functions over bind for callbacks, use bind for permanent binding (class constructors), use call for method borrowing, and avoid call/apply for normal invocation. Modern JS has better alternatives for many use cases.
Prefer spread: Math.max(...arr) instead of Math.max.apply(null, arr). Spread is more readable and modern. Use apply only in old codebases without spread support.
Prefer arrow functions for callbacks: setTimeout(() => obj.method(), 1000) instead of setTimeout(obj.method.bind(obj), 1000). Arrows are more readable. Use bind for permanent binding in class constructors.
For method borrowing: Array.prototype.slice.call(arguments). This is still the standard way to convert array-like objects to arrays, although Array.from(arguments) is a modern alternative.
In the constructor: this.method = this.method.bind(this). Or use arrow class fields: method = () => { ... }. Both ensure this is always the instance, even when the method is detached.
No. If you do not need to set this, just call the function normally: fn(arg) instead of fn.call(null, arg). Use call only when you need to set a specific this value.
Ready to master React completely?
Want to upskill yourself, crack your next interview, and get your dream job? Join our comprehensive course to dive deeper with high-quality video tutorials, solve interview questions, and a premium community.
Master React
Want to upskill yourself, crack your next interview, and get your dream job? Join our comprehensive course.