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  1. 123

    A for loop is a control flow statement that allows you to execute a block of code repeatedly based on a specified condition. It is commonly used when you know how many times you want to execute a block of code.

    Example in Python

    for i in range(5):
    print(i)
    Copied!

    This will output:

    0
    1
    2
    3
    4
    Copied!

    How For Loop Works

    1. Initialization: This part of the loop is where you initialize a variable or set a starting value for a counter variable that controls the loop. It typically occurs before the loop starts and is executed only once.

    2. Condition: The condition is a Boolean expression that determines whether the loop should continue executing or not. If the condition evaluates to true, the loop body is executed. If it evaluates to false, the loop terminates.

    3. Increment/Decrement: This part of the loop is responsible for updating the loop control variable after each iteration. It typically occurs at the end of each iteration and is used to modify the loop control variable to eventually make the condition false.

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  2. W3School
    https://www.w3schools.com › js › js_loop_for.asp

    JavaScript for Loop - W3Schools

    For Loops can execute a block of code a number of times. For Loops are fundamental for tasks like performing an action multiple times.
    Javascript Loops

    Loops are handy, if you want to run the same code over and over again, each time with a different value. Often this is the case when working with arrays:

    Different Kinds of Loops

    JavaScript supports different kinds of loops: 1. for- loops through a block of code a number of times 2. for/in- loops through the properties of an object 3. for/of- loops through the values of an iterable object 4. while- loops through a block of code whil…

    The For Loop

    The forstatement creates a loop with 3 optional expressions: Expression 1is executed (one time) before the execution of the code block. Expression 2defines the condition for executing the code block. Expression 3is executed (every time) afte…

    How to Use Expression 1

    Expression 1 is used to initialize the variable(s) used in the loop (let i = 0). But, expression 1 is optional. You can omit expression 1 when your values are set before the loop starts: You can intiate many values in expression 1 (separated by com…

  3. GeeksForGeeks
    https://www.geeksforgeeks.org › dsa › for-loop-in...

    For loop in Programming - GeeksforGeeks

    Mar 26, 2026 · A for loop allows you to repeat a block of code a specific number of times. Widely used when the number of iterations is known in advance. Makes it …

  4. Mozilla Developer
    https://developer.mozilla.org › en-US › docs › Web › ...

    for - JavaScript | MDN - MDN Web Docs

    Jul 8, 2025 · The for statement creates a loop that consists of three optional expressions, enclosed in parentheses and separated by semicolons, followed by a statement (usually a block statement) to be …

  6. Code.org
    https://studio.code.org › docs › concepts › javascript › for-loops

    Code.org Tool Documentation

    Learn how to use the for loop to repeat a set of commands a certain number of times in JavaScript. See the syntax, parts, and example of the for loop and compare it with if statements.

  7. Arduino Docs
    https://docs.arduino.cc › language-reference › en › ...

    for | Arduino Documentation

    May 15, 2024 · loops found in some other computer languages, including BASIC. Any or all of the three header elements may be omitted, although the semicolons are required. Also the statements for …

  8. Programiz
    https://www.programiz.com › c-programming › c-for-loop

    C for Loop (With Examples) - Programiz

    Learn how to use for loop in C programming to repeat a block of code until a condition is met. See the syntax, flowchart and examples of for loop with …

  9. JavaScript Tutorial
    https://www.javascripttutorial.net › javascript-for-loop

    JavaScript for Loop By Examples

    This tutorial shows you how to use the JavaScript for loop to create a loop that executes a block of code repeatedly in a specific number of times.

  10. Wikipedia
    https://en.wikipedia.org › wiki › Loop_(statement)

    Loop (statement) - Wikipedia

    Loop (statement) In computer programming, a loop is a control flow construct that allows code to be executed repeatedly, usually with minor alterations between repetitions. Loops can be used to …

  11. Processing
    https://processing.org › reference › for.html

    for / Reference / Processing.org

    Controls a sequence of repetitions. A basic <b>for</b> structure has three parts: <b>init</b>, <b>test</b>, and <b>update</b>. Each part must be separated by a …

  12. utah.edu
    https://users.cs.utah.edu › ~germain › PPS › Topics › for_loops.html

    Programming - For Loop - University of Utah

    A "For" Loop is used to repeat a specific block of code a known number of times. For example, if we want to check the grade of every student in the class, we loop from 1 to that number. When the …

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