String

_capitalize

Capitalizes first char, lowercases the rest of the string.

_capitalize('hello') // Hello
_capitalize('HELLO') // HELLO (no change)
_capitalize('hello world') // Hello world

_upperFirst

Uppercases first char.

_upperFirst('hello') // Hello
_upperFirst('HELLO') // HELLO (no change)
_upperFirst('hELLO') // HELLO

_lowerFirst

Lowercases first char.

_lowerFirst('Hello') // hello
_lowerFirst('hello') // hello (no change)
_lowerFirst('HELLO') // hELLO

_camelCase 🐪

Transforms the input string to camelCase 🐪. Implementation adapted from Lodash.

_camelCase('la la la')
_camelCase('la_la_la')
_camelCase('la-la-la')
// laLaLa

_snakeCase 🐍

Transforms the input string to snake_case 🐍. Implementation adapted from Lodash.

_snakeCase('la la la')
_snakeCase('la-la-la')
_snakeCase('laLaLa')
// la_la_la

_kebabCase 🥙

Transforms the input string to kebab-case 🥙. Implementation adapted from Lodash.

_kebabCase('la la la')
_kebabCase('la_la_la')
_kebabCase('laLaLa')
// la-la-la

_split

Like String.split, but with the limited number of tokens.

_split('a_b_c', '_', 2)
// ['a', 'b_c']

_substringBefore

_substringBefore('file1.test.ts', '.')
// 'file1'

_substringBefore('file1.test.ts', '.ts')
// 'file1.test'

_substringBeforeLast

_substringBeforeLast('file1.test.ts', '.')
// 'file1.test'

_substringAfter

_substringAfter('file1.test.ts', '.')
// 'test.ts'

_substringAfterLast

_substringAfterLast('file1.test.ts', '.')
// 'ts'

_substringBetweenLast

const s = '/Users/lalala/someFile.test.ts'
_substringBetweenLast(s, '/', '.'))
// 'someFile'

_truncate

Truncates the string to the needed length, putting ... (or a custom "ending") in the end, if needed. The maxLen (second argument) includes the "ending string" (3rd argument).

_truncate('Hello World!', 5) // 'He...'
_truncate('Hello World!', 6) // 'Hel...'
_truncate('Hello World!', 100) // 'Hello World!' (no truncation needed)

// Custom "ending"
_truncate('Hello World!', 5, '|') // 'Hell|'

_truncateMiddle

Truncates the string in the middle.

_truncateMiddle('abcdefghijklmnopqrstuvwxyz', 10)
// 'abcd...xyz'

_replaceAll

Polyfill for String.prototype.replaceAll.

Based on regex implementation (slightly faster than "split/join" implementation).

_nl2br

Converts \n (aka new-line) to <br>, to be presented in HTML.

Keeps \n, so if it's printed in non-HTML environment it still looks ok-ish.

_parseQueryString

Parses location.search string (e.g ?a=1&b=2) into a StringMap, e.g: { a: '1', b: '2' }

Pass location.search to it in the Frontend, or any other string on the Backend (where location.search is not available).

Works both with and without leading ? character.

Yes, there's URLSearchParams existing in the Frontend (not in Node yet), but it's API is not as convenient. And the implementation here is super-small.

Goal of this function is to produce exactly same output as URLSearchParams would.

// Assuming url is http://example.com?a=1&b=2

_parseQueryString(location.search)
// { a: '1', b: '2' }