![]() Sort an Array of Objects in JavaScript, TypeScript or Node.jsĬheck If a Value Is an Array in JavaScript or Node.js Sort an Array of Strings in JavaScript, TypeScript or Node.js How to Reverse an Array in JavaScript and Node.js Retrieve a Random Item From an Array in JavaScript or Node.js How to Exit, Stop, or Break an Array#forEach Loop in JavaScript or Node.js How to Get an Index in a for…of Loop in JavaScript and Node.js Split an Array Into Smaller Array Chunks in JavaScript and Node.js How to Exit and Stop a for Loop in JavaScript and Node.js Sort a Boolean Array in JavaScript, TypeScript, or Node.jsĬheck If an Array Contains a Given Value in JavaScript or Node.jsĪdd an Item to the Beginning of an Array in JavaScript or Node.jsĪppend an Item at the End of an Array in JavaScript or Node.js Sort an Array of Integers in JavaScript and Node.js Get an Array With Unique Values (Delete Duplicates) Passing initialValue is also helpful if you're not sure if there are items in your array, as reduce throws an error if the array is empty and no initialValue is supplied.How to Run an Asynchronous Function in Array.map()Ĭlone/Copy an Array in JavaScript and Node.js If initialValue is provided, the iteration will start from the first element. You can also pass initialValue to set the initial value to be different than the first element. In the end, the returned value will be 10. 1 + 2 is 3 so in the second iteration accumulator will be 3 and currentValue will be 3 (since it's the item in the array that is after 2), and so on. So, in the example above, in the first iteration accumulator will be 1 and currentValue will be 2. By default, its initial value is the value of the first element and the iteration starts from the second element. ![]() The accumulator parameter is the result after the last iteration before the current one, and its value, in the end, will be the value returned. reduce ( ( accumulator, currentValue ) => accumulator + currentValue )
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