Example 1: set js
// Use to remove duplicate elements from the array
const numbers = [2,3,4,4,2,3,3,4,4,5,5,6,6,7,5,32,3,4,5]
//spreading numbers of the object into an array using the new operator
console.log([...new Set(numbers)])
// [2, 3, 4, 5, 6, 7, 32]
Example 2: check if set has value js
const mySet = new Set();
// Add value to set
mySet.add(15);
console.log(mySet.has(33)) // expected output: false
cosole.log(mySet.has(15)) // expected output: true
Example 3: set in javascript
let mySet = new Set()
mySet.add(1) // Set [ 1 ]
mySet.add(5) // Set [ 1, 5 ]
mySet.add(5) // Set [ 1, 5 ]
mySet.add('some text') // Set [ 1, 5, 'some text' ]
let o = {a: 1, b: 2}
mySet.add(o)
mySet.add({a: 1, b: 2}) // o is referencing a different object, so this is okay
mySet.has(1) // true
mySet.has(3) // false, since 3 has not been added to the set
mySet.has(5) // true
mySet.has(Math.sqrt(25)) // true
mySet.has('Some Text'.toLowerCase()) // true
mySet.has(o) // true
mySet.size // 5
mySet.delete(5) // removes 5 from the set
mySet.has(5) // false, 5 has been removed
mySet.size // 4, since we just removed one value
console.log(mySet)
// logs Set(4) [ 1, "some text", {…}, {…} ] in Firefox
// logs Set(4) { 1, "some text", {…}, {…} } in Chrome
Example 4: add to set js
const mySet = new Set();
mySet.add(15);
mySet.add(33);
mySet.add(15);
for(let item of mySet) {
console.log(item)
// expected output: 15
// expected output: 33
}
Example 5: set.contains in javascript
const set = new Set();
set.add(1);
set.add(2);
set.add(3);
console.log(set.has(2)); //true
console.log(set.has(4)); //false