These loops execute the loop's body (the block) for as long as the condition remains truthy. JavaScript loops have several forms, but the main looping structures use a looping keyword, a condition, and a block. Most programming languages, including JavaScript, use loops to provide this capability. The return value of the callback function is provided as an argument for the following callback function call, causing the last call's return value to become the method's return value.Most programs require code that runs over and over until some ending condition occurs. If new elements have been added to the array since the reduce() method was called, then the callback function will not be called for those elements. The range of elements processed by the reduce() method is set before the first call to the callback function. The array.reduce() method does not change the array it was called on. The callback function will not be called on removed or missing array elements. To find the sum of array elements in JavaScript, you can use the array.reduce(function(total, currentValue, currentIndex, array), initialValue) method. How to find the sum of array elements in JavaScript? You can also convert string to array, convert array to JSON, convert array to string, and get a sum of array elements. JavaScript provides a rich set of built-in functions for joining, slicing, reversing, merging, copying, containing, cloning, inserting, clearing, and reducing arrays. In JavaScript, arrays start at index zero. Each value in the array has its serial number (index), which allows you to access the element by index. A JavaScript array is created using square brackets "" and enumerating the array elements using commas or by using the "new Array()" constructor. An array in JavaScript is a collection of data that is designed to store multiple values in a single variable.
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