Variable Length Arguments

Lecture 135:- Variable Length Arguments

In JavaScript, variable length arguments are implemented using the rest parameter syntax. The rest parameter syntax allows you to represent an indefinite number of arguments as an array.

Here is an example of using rest parameter syntax to create a function that can accept a variable number of arguments:

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function sum(...args) {  let result = 0;  for (let i = 0; i < args.length; i++) {    result += args[i];  }  return result; } console.log(sum(1, 2)); // Output: 3 console.log(sum(1, 2, 3)); // Output: 6 console.log(sum(1, 2, 3, 4)); // Output: 10

In the example above, the ...args syntax defines a rest parameter that captures any remaining arguments passed to the function as an array. The function then iterates over this array to calculate the sum of all arguments.

The rest parameter syntax can also be used in arrow functions, like so:

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const sum = (...args) => {  let result = 0;  for (let i = 0; i < args.length; i++) {    result += args[i];  }  return result; } console.log(sum(1, 2)); // Output: 3 console.log(sum(1, 2, 3)); // Output: 6 console.log(sum(1, 2, 3, 4)); // Output: 10

In this case, the ...args syntax is used in the parameter list of the arrow function to define a rest parameter.