Summary of 20 practical typescript single line codes

In today's article , I will share with you 20 Helpful TypeScript Single line code , These single line codes can quickly help us improve our development efficiency , I hope it works for you .

Let's start now .

01、 Wait for a specific amount of time （ In Milliseconds ）

const wait = (ms: number): Promise<void> => new Promise((resolve) => setTimeout(resolve, ms));

await wait(1000); // waiting 1 second
02、 Check whether the date is a working day

const isWeekday = (d: Date): boolean => d.getDay() % 6 !== ;

isWeekday(new Date(2022, 2, 21)); // -> true
isWeekday(new Date(2021, 2, 20)); // -> false

03、 Reverse string

const reverse = (s: string): string => s.split('').reverse().join('');

reverse('elon musk'); // -> 'ksum nole'

04、 Check whether a number is even .

const isEven = (n: number): boolean => n % 2 === ;

isEven(2); // -> true
isEven(3); // -> false

05、 Uppercase string

const capitalize = (s: string): string => s.charAt().toUpperCase() + s.slice(1);

capitalize('lorem ipsum'); // -> Lorem ipsum

06、 Check if the array is empty

const isArrayEmpty = (arr: unknown[]): boolean => Array.isArray(arr) && !arr.length;

isArrayEmpty([]); // -> true
isArrayEmpty([1, 2, 3]); // -> false

07、 Check the object / Whether the array is empty

const isObjectEmpty = (obj: unknown): boolean => obj && Object.keys(obj).length === ;

isObjectEmpty({
    }); // -> true
isObjectEmpty({
     foo: 'bar' }); // -> false

08、 Randomly generate integers

Generate a random integer based on two parameters .

const randomInteger = (min: number, max: number): number => Math.floor(Math.random() * (max - min + 1)) + min;

randomInteger(1, 10); // -> 7

09、 Generate random Boolean values

const randomBoolean = (): boolean => Math.random() >= 0.5;

randomBoolean(); // -> true

10、 Toggle Boolean

Toggle Boolean , Turn false into true , Turn true into false .

const toggleBoolean = (val: boolean): boolean => (val = !val);

toggleBoolean(true); // -> false

11、 transformation

Convert a string to a string with “-” Hyphenation string of .

const slugify = (str: string): string => str.toLowerCase().replace(/\s+/g, '-').replace(/[^\w-]+/g, '');

slugify('Hello World'); // -> hello-world

12、 Generate combinations with arrays

Randomly generate a set of arrays of any type .

const shuffleArray = <T>(arr: T[]): T[] => arr.sort(() => Math.random() - 0.5);

shuffleArray(<number[]>[1, 2, 3, 4, 5]); // -> [ 4, 5, 2, 1, 3 ]

13、 Convert ligature string to Luofeng string

const snakeToCamel = (s: string): string => s.toLowerCase().replace(/(_\w)/g, (w) => w.toUpperCase().substring(1));

snakeToCamel('foo_bar'); // -> fooBar

14、 Random integers

Generate a random integer according to the current time .

const randomInteger = (): number => new Date().getTime();

randomInteger(); // -> 1646617367345

15、 Random number string

Generate a random number string according to the current time .

const randomNumberString = (): string => new Date().getTime() + Math.random().toString(36).slice(2);

randomNumberString(); // -> 1646617484381wml196a8iso

16、 Convert numbers to characters / Letter

const numberToLetter = (value: number): string => String.fromCharCode(94 + value);

numberToLetter(4); // -> b

17、 Generate random hex colors

const randomHexColor = (): string => `#${
    Math.floor(Math.random() * 0xffffff).toString(16).padEnd(6, '0')}`;

randomHexColor(); // -> #dc7c40

18、 Delete the trailing slash of the string

const removeTrailingSlash = (value: string): string => value && value.charAt(value.length - 1) === '/' ? value.slice(, -1) : value;

removeTrailingSlash('foo-bar/'); // -> foo-bar

19、 Get the random items of the array

const randomItem = <T>(arr: T[]): T => arr[(Math.random() * arr.length) | ];

randomItem(<number[]>[1, 2, 3, 4, 5]); // -> 4

20、 Convert uppercase strings to lowercase

const decapitalize = (str: string): string => `${
    str.charAt(0).toLowerCase()}${
    str.slice(1)}`;

decapitalize('Hello world'); // -> hello world

The source code attachment has been packaged and uploaded to Baidu cloud , You can download it yourself ～

link : https://pan.baidu.com/s/14G-bpVthImHD4eosZUNSFA?pwd=yu27
Extraction code : yu27
Baidu cloud link is unstable , It may fail at any time , Let's keep it tight .

If Baidu cloud link fails , Please leave me a message , When I see it, I will update it in time ～

Open source address
Code cloud address ：
http://github.crmeb.net/u/defu

Github Address ：
http://github.crmeb.net/u/defu

source | https://blog.bitsrc.io/another-10-quick-typescript-one-liners-9f41713c158a