Map.prototype.has

Returns a boolean indicating whether an element with the specified key exists or not.

Syntax

has(key)

Parameters

• key

  The key of the element to test for presence in the Map object.

Return value

true if an element with the specified key exists in the Map object, false otherwise.

Examples

const map = new Map()
map.set("myKey", "myValue")
map.has("myKey")

true