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    The reduce function in JavaScript is a powerful array method that allows you to iterate over an array and accumulate a single value based on the elements of the array. It is particularly useful for operations like summing values, grouping items, or transforming data structures.

    How reduce Works

    The reduce method executes a callback function on each element of the array, passing in the return value from the previous iteration (the accumulator). The final result of running the reducer across all elements of the array is a single value.

    Syntax

    array.reduce(callbackFn, initialValue)
    Gekopieerd.

    • callbackFn: A function to execute on each element in the array.

    • initialValue (optional): A value to use as the first argument to the first call of the callbackFn.

    Callback Function Parameters

    The callbackFn is called with four arguments:

    1. accumulator: The accumulated value previously returned in the last invocation of the callback.

    2. currentValue: The current element being processed in the array.

    3. currentIndex (optional): The index of the current element being processed.

    4. array (optional): The array reduce was called upon.

    What is JavaScript array reduce method?
    Return value: The JavaScript array reduce method returns a single value/element after traversing the complete array. Parameters: This method accepts five parameters as mentioned above and described below: function (total, currentValue, index, arr): It is the required parameter and is used to run for each element of the array.
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    JavaScript Array reduce () Method - W3Schools
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  1. Mozilla Developer
    https://developer.mozilla.org ā€ŗ en-US ā€ŗ docs ā€ŗ Web ā€ŗ JavaScript ā€ŗ Reā€¦Dit resultaat vertalen

    Array.prototype.reduce () - JavaScript | MDN - MDN Web Docs

    The reduce() method of Array instances executes a user-supplied "reducer" callback function on each element of the array, in order, passing in the return value from the calā€¦
    Syntax

    Parameters
    callbackFn A function to execute for each element in the array. Its return value becomes the value of the accumulator parameter on the next invocation of callbackFn. For the last invocation, the retā€¦

    Description

    The reduce() method is an iterative method. It runs a "reducer" callback function over all elements in the array, in ascending-index order, and accumulates them into a single value. Every time, the return value of callbackFn is passed into callbackFn agaiā€¦

    Examples

    How reduce() works without an initial value
    The code below shows what happens if we call reduce() with an array and no initial value. The callback would be invoked four times, with the arguments and return values in each call being as follows: The array parā€¦

    Browser compatibility

    BCD tables only load in the browser with JavaScript enabled. Enable JavaScript to view data.

  3. W3School
    https://www.w3schools.com ā€ŗ jsref ā€ŗ jsref_reduce.aspDit resultaat vertalen

    JavaScript Array reduce () Method - W3Schools

    Learn how to use the reduce() method to execute a function for each element in an array and return a single value. See examples, syntax, parameters, and browser support for this ECMAScript5 feature.

  4. GeeksForGeeks
    https://www.geeksforgeeks.org ā€ŗ javascript ā€ŗ javascript-array-reducā€¦Dit resultaat vertalen

    JavaScript Array reduce () Method - GeeksforGeeks

    11 jul. 2025 · The JavaScript Array.reduce () method iterates over an array, applying a reducer function to each element, accumulating a single output value. It takes an initial value and processes elements ā€¦

  5. JavaScript Tutorial
    https://www.javascripttutorial.net ā€ŗ javascript-array-reduceDit resultaat vertalen

    JavaScript Array reduce () Method

    Learn how to use the reduce() method to iterate over an array and reduce its elements to a single value. See syntax, examples, and logic of the reduce() method with or without initial value.

  6. FreeCodecamp
    https://www.freecodecamp.org ā€ŗ ... ā€ŗ how-to-uā€¦Dit resultaat vertalen

    How to Use JavaScript's Array reduce() Method ā€“ ā€¦

    29 nov. 2023 · Learn how to use the reduce() method to iterate and reduce an array's values into one value. See how to sum, group, and remove duplicates ā€¦

  7. Stack Overflow
    https://stackoverflow.com ā€ŗ questionsDit resultaat vertalen

    javascript - What does the Array method `reduce` do?

    "The reduce () method applies a function against an accumulator and each value of the array (from left-to-right) to reduce it to a single value."

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  9. stephanmiller.com
    https://www.stephanmiller.com ā€ŗ javascript-rā€¦Dit resultaat vertalen

    JavaScript Reduce - Stephan Miller

    11 jan. 2024 · Learn how to use JavaScript reduce, a higher order function that can manipulate arrays and objects in various ways. See examples of summing, ā€¦

  10. javascriptdocument.com
    https://www.javascriptdocument.com ā€ŗ articles ā€ŗ javascript-reduceDit resultaat vertalen

    JavaScript reduce() Method - Complete Guide with Examples

    16 jan. 2025 · Learn JavaScript's powerful reduce () method. Master array aggregation, object building, data transformation, and advanced reduce patterns.

  11. DEV Community
    https://dev.to ā€ŗ comprehensive-guide-to-javascriā€¦Dit resultaat vertalen

    Comprehensive Guide to JavaScript `reduce ()` Method ā€¦

    6 dec. 2024 · The reduce() method is a powerful array method in JavaScript, used to iterate through an array and reduce it to a single value. This method is ā€¦

  12. Programiz
    https://www.programiz.com ā€ŗ javascript ā€ŗ library ā€ŗ array ā€ŗ reduceDit resultaat vertalen

    Javascript Array reduce () - Programiz

    Learn how to use the reduce() method to execute a function on each element of an array and return a single value. See examples of sum, subtract, remove duplicates, and group by property.

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