Introduction to Set in TypeScript:
sets in typescript are similar to set in any other programming language. It is used to store distinct data, i.e. each value in a set can occur only once.
Set class of TypeScript provides a couple of different methods as well. In this post, we will learn how to create a set and its different methods with example.
How to create a set:
We can create a set as like below:
let firstSet = new Set();It creates a Set firstSet without any item. Set class provides a couple of methods that can be used to modify its items.
Method and properties of Set class:
Following are the important methods and properties of Set class:
set.add() - add an item to the set
set.has() - check if an item is in the set
set.delete() - delete an item from the set
set.size - it returns the size of the set
set.clear() - it clears the set or it removes all items from the setExample to add items and delete items of a set:
Let’s take a look at the below example:
let firstSet = new Set();
firstSet.add('one');
firstSet.add('two');
firstSet.add('three');
console.log(firstSet.has('one'));
console.log(firstSet.size);
firstSet.delete('one');
console.log(firstSet.size);
firstSet.clear();
console.log(firstSet.size);Here, we are using all the methods and properties shown above. It prints the below output:
true
3
2
0How to iterate through a set:
We can iterate through a set using a forEach or for..0f :
let firstSet = new Set();
firstSet.add('one');
firstSet.add('two');
firstSet.add('three');
firstSet.forEach(e => console.log(e));
for(let value of firstSet){
console.log(value);
}Both of these loops will print the values of firstSet.
