Baseline Widely available
The add() method of Set instances inserts a new element with a specified value in to this set, if there isn't an element with the same value already in this set
const set1 = new Set();
set1.add(42);
set1.add(42);
set1.add(13);
for (const item of set1) {
console.log(item);
// Expected output: 42
// Expected output: 13
}
value
The value of the element to add to the Set object.
The Set object with added value.
const mySet = new Set();
mySet.add(1);
mySet.add(5).add("some text"); // chainable
console.log(mySet);
// Set [1, 5, "some text"]
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