JavaScript For Loop

Revised 4 minutes, 34 seconds read By Edward

For Loop In JavaScript

Loops execute one or more statements up to a specific number of times.

Loops allow repetitive tasks to be executed using minimal code. For loop requires three parts, the initialization or loop variant, the condition and advancement to next iteration.

Loops allow complex tasks to be simplified by automating similar operations.

Common Syntax For Loop In JavaScript

Common For Loop Conditions

Ojamboshop.com Learning JavaScript For Loop
Name Description Example
part 1 executed once before code block let i = 0;
part 2 defines condition for code block i < even_numbers.length;
part 3 executed after each code block iteration i++
break End execution of current structure break;
continue Skip rest of current loop iteration continue;
Name Description Example

JavaScript For Loop Snippet

// OjamboShop.com Learning JavaScript For Loop Tutorial //
let even_numbers = [2,4,6,8,10];
let names = ["Jake", "John", "James"];
// Without Loops
console.log(even_numbers[0]);
console.log(even_numbers[1]);
console.log(even_numbers[2]);
console.log(even_numbers[3]);
console.log(even_numbers[4]);
console.log(names[0]);
console.log(names[1]);
console.log(names[2]);
// For Loop
for (let i = 0; i < even_numbers.length; i++) {
    let even_number = even_numbers[i];
    console.log(even_number + "\n");
}
for (let n = 0; n < names.length; n++) {
    let name = names[n];
    console.log(name + "\n");
}

JavaScript For Loop Code
OjamboShop.com Web IDE JavaScript For Loop Code

JavaScript For Loop Result
OjamboShop.com Web IDE Compiler Displaying JavaScript For Loop Result


Usage

You can use any IDE or text editor and the web browser to compile and execute JavaScript code. For this tutorial, the OjamboShop.com Learning JavaScript Course Web IDE was used to input and compile JavaScript code for the for loop.

Open Source

JavaScript follows the ECMAScript standard and is licensed under the W3C Software License by web browser vendors and runtime environment vendors. This allows commercial use, modification, distribution, and allows making derivatives proprietary.

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Conclusion:

JavaScript makes it easy to use for loop statements. Use a for loop to iterate over data when referring to a changing index.

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