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. Feb 24, 2026 · The array argument is not the array that is being built, in the case of methods like map(), filter(), and flatMap() — there is no way to access the array being built from the callback function. Almost all array methods that call functions – like find, filter, map, with a notable exception of sort, accept an optional additional parameter thisArg. That parameter is not explained in the sections above, because it’s rarely used.
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