In JavaScript, .call and .apply are considered a method of function object.
.call method
Count the number of arguments with call method. It accepts one or more arguments as objects.
Here’s the syntax:
.call(object, “argument1”, “argument2”);
.apply method
To use an array as an argument, use .apply. It requires an array as its 2nd argument.
Here’s the syntax:
.apply(object, [“argument1”, “argument[]”]);
Example
Let’s see an example showing both call and apply method:
<!DOCTYPE html>
<html>
<head>
<body>
<script>
var p = {
q: "Hello"
}
function showResult(v) {
document.write(this.q + " " + v);
}
showResult.call(p, "Amit"); // one or more objects as argument
showResult.apply(p, ["World"]); // array as the second argument
</script>
</body>
</head>
</html>