WeakMaphasbeginner

WeakMap.prototype.has() — existing key

📖 Usage Example

const wm = new WeakMap()
const k = {}
wm.set(k, 1)
wm.has(k)  // → true

has() returns true if the given object key exists in the WeakMap.

WeakMap has()

wm.has(key) returns true when the key exists.

Challenge: Verify has() returns true for an existing key.

💡 Hints (1)

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