Web Reference: Jul 23, 2025 · The filter () method in JavaScript creates a new array containing elements that pass a specified condition. It iterates through each element of the array, executing the condition for each element and including elements that return true in the filtered array. 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. Feb 24, 2026 · JavaScript arrays are not associative arrays and so, array elements cannot be accessed using arbitrary strings as indexes, but must be accessed using nonnegative integers (or their respective string form) as indexes.
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