javascript 1 min read
What's the difference between JavaScript call and apply
Written in Sep 2019. Some details may be out of date.
You can use call / apply methods to invoke a function immediately.
call and apply methods serve to the same purpose. They
call a function with given this value and arguments. While the syntax
of both functions is almost same, the main difference is that call accepts
arguments as an argument list, however apply accepts a single array
of arguments.
Check out the code below to see how call method is used.
function Animal(name, hasWings) {
this.name = name;
this.hasWings = hasWings;
}
function Bird(name, hasWings) {
Animal.call(this, name, hasWings);
this.canFly = false;
}
console.log(new Bird('Chicken', true).name);Check out the code below to see how apply method is used.
function Animal(name, hasWings) {
this.name = name;
this.hasWings = hasWings;
}
function Bird(name, hasWings) {
Animal.apply(this, [name, hasWings]);
this.canFly = false;
}
console.log(new Bird('Chicken', true).name);