JavaScript Set

JavaScript Set

JavaScript Set allows values ​​to have unique values. You insert a value through add(), but if there is an existing value, the value is not added.

Declaration

const set01 = new Set();

Inserting a value

set01.add('value01');
set01.add('value02');
set01.add('value03');
set01.add('value02');
set01.add(5);
 
// Actual inserted value
// Set(4) {'value01', 'value02', 'value03', 5}

Calling values

• Values ​​are only called by iteration.

console.log('output');
 
for (const item of set01) {
console.log(item);
 
// output
// value01
// value02
// value03
// 5

Value existence

set01.has('value01');
 
// true

Deleting values

set01.delete('value02');
 
// Actual inserted value
// Set(4) {'value01', 'value03', 5}

Initialize all values

set01.clear();

Other

Only frequently used functions are introduced.

In addition, there are keys, values, difference, etc.

You can apply and use them if there is no duplication and they are unique.