JavaScript data structure-dictionary

concept

A dictionary is also a data structure that stores unique values , but it is stored in the form of key-value pairs .

Common operations of the dictionary: add, delete, modify, and check.

achieve

Available Map()representation dictionaries in JavaScript :

const m = new Map();

// 增
m.set('a', 'aaa');
m.set('b', 'bbb');
m.set('c', 'ccc');
// Map(3) { 'a' => 'aaa', 'b' => 'bbb', 'c' => 'ccc' }

// 删
m.delete('b');
// Map(2) { 'a' => 'aaa', 'c' => 'ccc' }
m.clear();
// Map(0) {}

// 改
m.set('a', 'aaa');
m.set('b', 'bbb');
m.set('a', '11111');
// Map(2) { 'a' => '11111', 'b' => 'bbb' }

// 查
console.log(m.get('a'));
// 11111