forEach Method in Java Script

 In JavaScript, the forEach method is used to iterate over elements of an array and execute a provided function once for each array element. It's a clean and readable way to loop through array elements.

Syntax

  array.forEach(callback(currentValue, index, array), thisArg);

Parameters

1. callback: A function that gets executed for each array element. It takes three arguments:

   • currentValue: The current element being processed.
   • index (optional): The index of the current element.
   • array (optional): The array forEach is iterating over.

2. thisArg (optional): A value to use as this when executing the callback.

Example 1: Basic Iteration

const numbers = [1, 2, 3, 4];

numbers.forEach((num) => {

  console.log(num);

});

// Output:

// 1

// 2

// 3

// 4

Example 2: Using Index

  const fruits = ['apple', 'banana', 'cherry'];

  fruits.forEach((fruit, index) => {

    console.log(`${index}: ${fruit}`);

  });

  // Output:

  // 0: apple

  // 1: banana

  // 2: cherry

Notes

• Does not return a value: Unlike map, forEach does not create a new array but operates on the original array.
• Cannot be stopped: You cannot use break or continue in a forEach loop. If you need to break out of a loop, consider using a traditional for loop or a for...of loop.