Set
We'll cover the following...
In the previous chapter we looked at the Map object, and how we can use it to store key/value pairs. In this chapter we will look at Set and how to store unique values.
A Set is created in the same way as Map.
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const shoppingList = new Set();
add()
With a Set we can use the .add() method to add elements to the Set. This is where a Map and Set differ: there are no keys in a Set.
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shoppingList.add('Milk');shoppingList.add('Cheese');
Adding multiple values
When we create a new Set we can pass in an array of values for our Set.
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const shoppingList = new Set(['Milk','Cheese']);
has()
The .has method can be used to check if a value exists in the Set. ...