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Check Key in Map

Use has() to check if a key exists in a Map.

Preview

Code

<script>
let map = new Map();

map.set("id",101);

console.log(map.has("id"));
console.log(map.has("name"));
</script>

More JS Maps Examples (7)

example JavaScript Map Example open example example Get Value from Map open example example Map Size Property open example example Delete Map Entry open example example Loop Through Map open example example Map Keys and Values open example example Map with Object Keys open example