Array Iteration in JavaScript

Array iteration is a common task in JavaScript, where you need to perform operations on each element of an array. JavaScript provides several methods and techniques to iterate over arrays efficiently. In this explanation, we'll cover the key array iteration methods (loops in JavaScript) and techniques in JavaScript.

The for loop is a traditional looping construct that can be used to iterate over arrays. It requires an index variable and uses the array's length property to control the loop.

For example:

let numbers = [1, 2, 3, 4, 5];
for (let i = 0; i < numbers.length; i++) {
    console.log(numbers[i]);
}

In this example, the for loop iterates over the numbers array using the index variable i. The loop runs as long as i is less than the array's length, accessing each element using the index.

The forEach method is a built-in array method that executes a provided callback function once for each element in the array. It simplifies the process of iterating over arrays and is especially useful when you want to perform a task on each element.

For example:

let numbers = [1, 2, 3, 4, 5];
numbers.forEach(function(number) {
    console.log(number);
});

In this example, the forEach method is used to iterate over the numbers array. The callback function is invoked for each element, and the element is passed as an argument to the function.