> For the complete documentation index, see [llms.txt](https://yurace.gitbook.io/cheatjs/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://yurace.gitbook.io/cheatjs/javascript/js-string-methods.md).

# String methods cheatsheet

[Download image version](https://github.com/cheatjs/cheat/blob/master/JavaScript/String-methods/js-string-methods.png)

## Changing the case

* **toLowerCase / toUpperCase**()\\

```js
const str = "Hello";
const low = str.toLowerCase(); // hello
const up = str.toUpperCase(); // HELLO
```

***

## Combining strings

* **concat**(...items)\
  *Combines two or more strings and returns one string*

```js
const str = "Hello";
const str2 = "World!";
const newStr = str.concat(" ", str2);
// newStr = "Hello World!"
```

***

## Splitting a string

* **split**(separator, limit)\
  *Splits a string into an array by the specified separator, which can be a substring or a regular expression*

```js
const str = "Just some text";
const arr = str.split(" ");
arr = ["Just", "some", "text"];
```

***

## Repeating a string

* **repeat**(count)\
  *Repeats the string the specified number of times*

```js
const str = "hey";
const newStr = str.repeat(3);
// newStr = "heyheyhey"
```

***

## Substring search

* **charAt**(index)\
  *Returns a character at the specified index*

```js
const str = "hello";
const char = str.charAt(1);
// char = "e"
```

* **includes**(substr, startPositon)\
  *Checks if the string contains the specified substring and returns true/false*

```js
const str = "example@gmail.com";
str.includes("gmail"); // true
```

* **indexOf / lastIndexOf**(substr, startPositon)\
  *Returns the index of the first/last substring found, otherwise returns -1*

```js
const str = "example@gmail.com";
str.indexOf("@"); // 6
str.lastIndexOf("m"); // 15
```

* **endsWith / startsWith**(substr, searchLength)\
  *Checks if the string ends/starts with the specified substring and returns true/false*

```js
const link = "www.google.com";
link.startsWith("www"); // true
link.endsWith(".com"); // true
```

* **search**(substr)\
  *Checks if there is a specified substring or regular expression in the string and returns the index of the beginning of the match*

```js
const str = "first name, second name";
str.search("name"); // 6
```

***

## Extracting a substring

* **slice**(start, end)\
  *Extracts part of the string starting at the `start` position and ending at the `end`-1 position*

```js
const str = "javascript";
const substr = str.slice(4); // script
const substr = str.slice(0, 4); // java
```

* **substring**(start, end)\
  *Extracts substring from a string between `start` and `end`. Unlike `slice()`, you can set `start` more than `end`.*

```js
const str = "javascript";
const substr = str.substring(4); // script
const substr2 = str.substring(4, 0); // script
```

* **substr**(start, length)\
  *Extracts part of a string of a specified `length`. The first parameter can be negative, then the position is determined from the end of the string.*

```js
const str = "typescript";
const sub = str.substr(4, 6); // script
const sub2 = str.substr(-6); // script
```

***

## Replacing a substring

* **replace**(substr, newSubstr)\
  *Searches for the specified substring (or regular expression) in the string and replaces it with another one*

```js
const str = "typescript";
const str2 = str.replace("type", "java");
// str2 = javascript
```

* **replaceAll**(substr, newSubstr)\
  *Replaces all found matches with another string or passed function*

```js
const str = "one two three";
const str2 = str.replaceAll(" ", "-");
// str2 = one-two-three
```

***

## Adding characters

* **padStart / padEnd**(strLength, str)\
  *Adds padding at the beginning/end of a string until the string reaches the length specified by the first parameter*

```js
const msg = "hello";
msg.padStart(10, "_"); // "_____hello"
msg.padStart(7); // "  hello"
msg.padEnd(10, "*"); // "hello*****"
```

***

## Removing spaces

* **trim / trimStart / trimEnd**()\
  *Deletr spaces at both ends of the string, either only at the beginning or only at the end*

```js
const str = "  hello   ";
str.trim(); // "hello"
str.trimStart(); // "hello   "
str.trimEnd(); // "  hello"
```

***

## Working with ASCII code

* **charCodeAt**(index)\
  *Returns the ASCII code of the character at the specified `index`*

```js
const str = "AaBbCc";
str.charCodeAt(); // 65 (because it's "A")
str.charCodeAt(3); // 98 (because it's "b")
```

* **fromCharCode**(...code)\
  *Converts ASCII code to readable characters*

```js
const str = String.fromCharCode(74, 83);
// str = "JS"
```