String.prototype.toLowerCase() - JavaScript | MDN

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String.prototype.toLocaleLowerCase()

String.prototype.toLocaleUpperCase()

String.prototype.toUpperCase()

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

[Symbol.iterator]()

[Symbol.hasInstance]()

__defineGetter__()

__defineSetter__()

__lookupGetter__()

__lookupSetter__()

propertyIsEnumerable()

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