Dictionaries Example

---

Initialization

let emptyDictionary: {[key: string]: number} = {};
let anotherEmptyDict: {[key: string]: number} = {};
let strings: {[key: string]: string} = {
    'a': 'A',
    'b': 'B',
};

Accessing and assigning elements

console.log(strings['a']);
strings['a'] = 'AZ';
strings['a'] = 'AX';

Handling non-existing keys

let a = strings['a'];
if (a) console.log(a);

Removing

delete strings['a'];
delete strings['nope'];

Updating

strings['a'] = 'A';

Iterating

for (const [key, val] of Object.entries(strings)) console.log(`${key}: ${val}`);
for (const key of Object.keys(strings)) console.log(`KEY: ${key}`);
for (const val of Object.values(strings)) console.log(`VAL: ${val}`);

Getting all keys & values

let keys = Object.keys(strings);
let vals = Object.values(strings);

Clearing everything

strings = {};

console.log(Object.keys(strings).length);