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JavaScript Tutorial

Variables to closures, promises, the DOM and OOP — a complete JS reference.

WeakMap.prototype.has()

Checks whether an object key exists.

Quick-reference summary — a full handcrafted walkthrough is coming soon for this topic.

Checks whether an object key exists.

  • Category: JS WeakMap Reference — part of the JavaScript Tutorial on GoCareerGo
  • Read the short summary above, then check the linked docs for full syntax/behaviour
  • Interview tip: be ready to explain "WeakMap.prototype.has()" in one sentence, then back it up with a tiny example
// WeakMap.prototype.has() — minimal example
console.log("WeakMap.prototype.has()");
Tip

Quick recall: "WeakMap.prototype.has()" — checks whether an object key exists.