prefer-rest-params.md

Pattern: Use of arguments object

Issue: -

Description

The arguments object is an array-like object that lacks array methods, making it cumbersome to use. Rest parameters provide actual arrays with all array methods available and make variable argument handling more explicit.

Examples

Example of incorrect code:

function sum() {
  console.log(arguments);
  return Array.prototype.slice.call(arguments).reduce((a, b) => a + b);
}

function log() {
  const args = [].slice.call(arguments);
  args.forEach(console.log);
}

function apply(fn) {
  return fn.apply(null, arguments);
}

Example of correct code:

function sum(...numbers) {
  console.log(numbers);
  return numbers.reduce((a, b) => a + b);
}

function log(...args) {
  args.forEach(console.log);
}

function apply(fn, ...args) {
  return fn(...args);
}

// Arguments as parameter name is fine
function example(arguments) {
  console.log(arguments);
}