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October 6, 2020 10:54
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Объект Map() Object Map()
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let map = new Map(); | |
map.set('42', 4222); | |
map.set(42, '4222'); | |
map.set(44, '666'); | |
console.log(map.get('42')); // 4222 | |
console.log(map.has('42')); // true | |
console.log(map.has(43)); // false | |
console.log(map.size); // 3 | |
console.log(map); | |
map.delete(44); // Удалит один | |
console.log(map); // Выведет весь объект | |
map.clear(); // Очистит весь массив | |
console.log(map); | |
map.set('HTML', 'HyperText Markup Language') | |
.set('CSS', 'Cascading Style Sheets') | |
.set('JS', 'Javascript coding language'); | |
console.log(map.keys()); | |
console.log(...map.keys()); | |
console.log([...map.keys()]); | |
console.log('-----'); | |
console.log(map.values()); | |
console.log(...map.values()); | |
console.log([...map.values()]); | |
console.log('-----'); | |
console.log(map.entries()); | |
console.log(...map.entries()); | |
console.log([...map.entries()]); | |
let map2 = new Map(map.entries()); | |
console.log([...map2.entries()]); | |
map.forEach((value, key, map) => console.log(value, key, map)); |
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