snippet case js

Here's your cheatsheet rewritten in Markdown format, which is ideal for documentation or note taking.

## JavaScript String Case Conversion Cheatsheet

### 1. lower case
Converts all the characters in the string to lower case.
```javascript
str.toLowerCase();
```

### 2. UPPER CASE
Converts all the characters in the string to upper case.
```javascript
str.toUpperCase();
```

### 3. snake_case
Converts a string into snake case, where each word is lowercased and separated by underscores.
```javascript
str.replace(/[A-Z]/g, letter => `_${letter.toLowerCase()}`);
```

### 4. kebab-case
Converts a string into kebab case, where each word is lowercased and separated by hyphens.
```javascript
str.toLowerCase().replace(/[A-Z]/g, ' ').split(' ').join('-');
```

### 5. PascalCase
Converts a string into Pascal case, where the first letter of each word is capitalized and words are joined without spaces.
```javascript
str.replace(/\W+(.)/g, (match, chr) => chr.toUpperCase()).replace(/^\w/, (c) => c.toUpperCase());
```

### 6. camelCase
Converts a string into camel case, similar to Pascal case but the first letter of the result is in lower case.
```javascript
str.replace(/\W+(.)/g, (match, chr) => chr.toUpperCase()).replace(/^\w/, (c) => c.toLowerCase());
```