What is the set.add() method in TypeScript?
Overview
A set is a data structure that stores data that is unique and without duplicates. We use the add() method to add a value to a set.
Syntax
theSet.add(value)// Or chain the add() methodtheSet.add(value1).add(value2).add(valueN)
Add a value to a set in Typescript
Note: This method can be chained as shown in the syntax above.
Parameters
theSet: This is the set to which we want to add values.
value1, value2, and valueN: These are the values we want to add to the set.
Return value
The value returned is a new set with the value added to it.
Example
// create some set instanceslet names = new Set<string>()let evenNumbers = new Set<number>()let countries = new Set<string>()let isMarried = new Set<boolean>()// add values to the setsnames.add("Theodore")names.add("Celeste")names.add("Dave")evenNumbers.add(2).add(4).add(8).add(10)countries.add("Nigeria").add("Puerto Rico").add("Chile").add("India")isMarried.add(true)isMarried.add(false)// log out all the setsconsole.log(names)console.log(evenNumbers)console.log(countries)console.log(isMarried)
Explanation
- Lines 2–5: We create some sets.
- Lines 8–16: We use the
add()method to add values to the sets. - Lines 19–22: We print the sets to the console.
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