Array.prototype.concat() - JavaScript | MDN

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Symbol.isConcatSpreadable

The concat() method is a copying method. It does not alter this or any of the arrays provided as arguments but instead returns a shallow copy that contains the same elements as the ones from the original arrays.

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This page was last modified on Jul 10, 2025 by MDN contributors.

[Symbol.iterator]()

[Symbol.unscopables]

[Symbol.hasInstance]()

__defineGetter__()

__defineSetter__()

__lookupGetter__()

__lookupSetter__()

propertyIsEnumerable()

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