Map

Initialize

const map = new Map([
  ['key1', 'value1'],
  ['key2', 'value2'],
]);

Methods

• map.set(key, value)

• map.get(key)

• map.has(key)

• map.delete(key)
• map.clear()
• map.size

Iteration

for (const [key, value] of map) {
  console.log(key, value);
}

Set

Initialize

const set = new Set([1, 2, 3]);

Methods

• set.add(value)
• set.has(value)
• set.delete(value)
• set.clear()
• set.size

Iteration

for (const value of set) {
  console.log(value);
}