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Version: 3.14.1

WeakMap.prototype.has()

The has() method returns a boolean indicating whether an element with the specified key exists in the WeakMap object or not.

Syntax​

has(key)

Parameters​

  • key
    • : Required. The key of the element to test for presence in the WeakMap object.

Return value​

  • Boolean
    • : Returns true if an element with the specified key exists in the WeakMap object; otherwise false.