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. May 31, 2023 · The new array methods introduced in ES2023 make JavaScript programs more predictable and maintainable by allowing you to perform operations on arrays without changing the data in place. Jan 6, 2026 · ES2023 introduces a set of array methods that prioritize immutability by returning new copies rather than modifying arrays in place. These methods address common functional programming patterns and provide safer alternatives to destructive operations.
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