LANGUAGE » JAVASCRIPT

String

Last updated:

Reference:developer.mozilla.org

Usage

let str1 = 'Some string'
let str2 = `Value of a is ${a}`  // Template string [ES6]

Method	Returns	Description
`charAt`	`string`	Get character from `index`.
`startsWith`	`boolean`	Checks whether a string starts with the characters of `pattern`.
`endsWith`	`boolean`	Checks whether a string ends with the characters of `pattern`.
`includes`	`boolean`	Determine whether a given string may be found within this `searchString`.
`indexOf`	`number`	Get the index of the first occurrence of the specified `searchString`.
`match`	`array`	Find matching results (with `g` flag) or captured groups (without `g` flag) with the given `regex`.
`padEnd`	`string`	Pads `length` from end with the given `string`.
`padStart`	`string`	Pads `length` from start with the given `string`.
`replace`	`string`	Replace first match (if `pattern` is string) or all matches (if `pattern` is regex) with `replacement`.
`search`	`number`	Same as `indexOf`, but uses `regex` as parameter.
`slice`	`string`	Same as, for example, `text[5:10]` in python.
`split`	`array`	Splits by separator.
`toLowerCase`	`string`	Convert to lower case.
`toUpperCase`	`string`	Convert to upper case.
`trim`	`string`	Remove whitespace from both ends.

Split by lines:

const lines = text.split(/\r?\n/);

Replace all:

text.replace(/-/g, '');  // Must have the g option
text.split('-').join('');

Capitalize:

text.charAt(0).toUpperCase() + text.slice(1);

Add zeros to the left of a number:

String(1).padStart(2, '0');  // "01"