String Length in JavaScript
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The string length property in JavaScript returns the length of string in UTF-16 code units. It returns 0 when the string is empty, it's length. JavaScript uses a UTF-16 string format to depict the most common characters, consisting of a 16-bit data unit. The value returned by length does not match the number of characters in the string. When a string is empty, its length is 0.
Syntax
The syntax of string length property in JavaScript is:
Where string is the name of the string. The string length property in JavaScript doesn't take any parameters.
Return Value
The string length property will return the number of characters present in the string.
Examples
JavaScript Code to Show the Working of string.length Property
Output:
Assigning to length
Output:
Browser compatibility
| Browser | length |
|---|---|
| Chrome | 1 |
| Edge | 12 |
| Firefox | 1 |
| Internet Explorer | 3 |
| Opera | 3 |
| Safari | 1 |
| WebView Android | 1 |
| Chrome Android | 18 |
| Firefox for Android | 4 |
| Opera Android | 10.1 |
| Safari on iOS | 1 |
| Samsung Internet | 1.0 |
| Deno | 1.0 |
| Node.js | 0.10.0 |
Conclusion
- The string length property in JavaScript determines the length of the string, that is, the number of characters it contains.
- Internally, to calculate the number of characters, it counts the number of code units occupied by the string.
- In the case of an empty string, it returns 0.