Web Reference: ES2019 added the Array flatMap() method to JavaScript. The flatMap() method first maps all elements of an array and then creates a new array by flattening the array. Jun 10, 2010 · So when you want to "loop through" an array, you have a question to answer: do you want to loop over the full range indicated by its length and process undefined s for any missing elements, or do you only want to process the elements actually present? Aug 5, 2025 · The for...of loop is a modern way to loop through arrays in JavaScript. It iterates directly over the values of the array, which makes the syntax more concise and easier to understand compared to the traditional for loop.
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