![]() Let value1: string | undefined = hashmap.get(1) Setting up number-string pairs into the hashmap. is number and data type of the value is string. Next, we access the values related to a particular key using the get() method. After that, we used the set() method to set the 7 different key-value pairs in the hashmap. In the example below, we have created a map and stored it in the “hashmap”. Size − The size is a variable of the map class contains the numeric value representing the total number of key-value pair hashmap contains.Ĭlear() − The clear() method removes the all key-value pairs from the map() object and makes its size to 0. ![]() Has(key) − The has() method also takes the key as a parameter and checks whether the hashmap contains the particular key and its mapped value. If the user passes the existing key, the set() method replaces the existing key's value.ĭelete(key) − The delete() method takes the key as a parameter and deletes the key and its mapped value from the map object. It takes the key as the first parameter and the value as the second parameter. Set(key, value) − The set() method of the map class allows us to set the key-value pair in the map. The hashmap contains the unique keys, and we can access its value using the get() method. Get(key) − The get() method of the map class is useful to get the value stored in the map for the particular key. Users can see the explanation for every method below. The map class of the TypeScript contains the 5 to 6 methods that we can invoke by taking any object of the map class as a reference. Value_Type − It is a data type of the value. Users can use String, numbers, boolean, Object, Array, etc. Syntaxįollowing is the syntax create the map in TypeScript − let hashMap = new Map() ![]() In TypeScript, we can define the type of the key and value to be stored in the map. So, we need to create a map of the generic type. ![]() In JavaScript, we can't define the key or value type that needs to be stored in the map. Like other programming languages, TypeScript also contains a built-in map data structure. The Hashmap is the one kind of data structure that stores the key-value pairs of the different data. ![]()
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