contains

public bool contains(string key)

A Boolean value representing whether the key is in the dictionary: true if the specified key is in the dictionary and false otherwise.

Parameters

key

The key to check.

Checks if the specified key is in the dictionary. This method returns true if the specified key is in the dictionary; otherwise, this method returns false.

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import System;   Dictionary<int> dict = { a: 1, b: 2, c: 3 }; Console.log(dict.contains("a")); // true Console.log(dict.contains("b")); // true Console.log(dict.contains("c")); // true Console.log(dict.contains("d")); // false Console.log(dict.contains("z")); // false