What is the Dict.set() function in Node.js?
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In this shot, we will discuss the Dict.set() function in Node.js. The Dict collection is available in the collections package. To install the collections package, you can execute the command below:
npm i collections
Install the collections module
The Dict.set() function is used to insert a key-value pair in the dictionary collection.
Syntax
The syntax of the Dict.set() function is given below:
void set(K key, V value);
Syntax of the Dict.set() function in Node.js
Parameter
The Dict.set() function accepts two parameters:
- Key: The value of the key that we want to insert in the dictionary collection.
- Value: The value associated with the key above that needs to be inserted in the dictionary collection.
Return
The Dict.set() function returns a boolean value where true indicates the new key-value pair has been inserted successfully and false indicates that the key-value pair is not inserted.
Code
Let’s see how this function is used in the code.
var Dict = require("collections/dict");var dictionary_obj = new Dict({'a': 1, 'b': 2});console.log("Number of elements in Dictionary: ", dictionary_obj.length);console.log("Elements in the Dictionary: ",dictionary_obj.toObject());var is_element_inserted = dictionary_obj.set('c', 3);is_element_inserted = dictionary_obj.set('d', 4);console.log("Are the elements inserted?: ", is_element_inserted)console.log("Number of elements in Dict: ", dictionary_obj.length);console.log("Elements in the Dictionary: ", dictionary_obj.toObject());
Explanation
- In line 1, we import the require package.
- In line 3, we create an object of Dict collection and added two key-value pairs in the dictionary object.
- In lines 5 and 6, we print the number of key-value pairs and the key-value pairs itself that are present in the dictionary object using the length and the toObject()method.
- In lines 8 and 9, we call the set() function and pass the key-value pairs that needs to be inserted.
- In line 10, we print the boolean value indicating whether the insertion was successful.
- Finally, in lines 12 and 13, we print the number of elements and the elements that are present in the dictionary, after inserting the new key-value pairs.
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