Created
July 31, 2024 06:56
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| const map = new Map(); | |
| map.set(1, 'Number one'); | |
| map.set('1', 'String one'); | |
| map.set(true, 'Boolean true'); | |
| console.log(map.get(1)); // Output: Number one | |
| const map = new Map(); | |
| map.set('a', 1); | |
| map.set('b', 2); | |
| map.set('c', 3); | |
| for (const [key, value] of map) { | |
| console.log(`${key}: ${value}`); | |
| } | |
| // Output: | |
| // a: 1 | |
| // b: 2 | |
| // c: 3 | |
| const map = new Map(); | |
| map.set('a', 1); | |
| map.set('b', 2); | |
| console.log(map.size); // Output: 2 | |
| const map = new Map(); | |
| map.set('key', 'value'); | |
| console.log(map.get('key')); // Output: value | |
| console.log(map.has('key')); // Output: true | |
| map.delete('key'); | |
| console.log(map.has('key')); // Output: false | |
| map.clear(); | |
| console.log(map.size); // Output: 0 | |
| const map = new Map(); | |
| map.set('a', 1); | |
| const obj = Object.fromEntries(map); | |
| console.log(JSON.stringify(obj)); // Output: {"a":1} | |
| const objKey = {}; | |
| const map = new Map(); | |
| map.set(objKey, 'Object as key'); | |
| console.log(map.get(objKey)); // Output: Object as key | |
| const user = { | |
| name: 'John Doe', | |
| age: 30, | |
| occupation: 'Developer' | |
| }; | |
| function countOccurrences(arr: any[]): Map<any, number> { | |
| const map = new Map(); | |
| for (const item of arr) { | |
| map.set(item, (map.get(item) || 0) + 1); | |
| } | |
| return map; | |
| } | |
| const result = countOccurrences([1, 2, 2, 3, 3, 3]); | |
| console.log(result); // Output: Map { 1 => 1, 2 => 2, 3 => 3 } |
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