JavaScript Slice
slice() extracts a section of a string between a start and (optional) end index and returns it as a new string. Indexes are zero-based, and negative numbers count from the end — its killer feature.
Syntax
str.slice(start, end)Examples
| Input | Arguments | Output |
|---|---|---|
| "hello" | 0, 3 | "hel" |
| "hello" | -2 | "lo" |
| ↳ Negative index counts from the end. | ||
When to use it
- Take a prefix, suffix or fixed-width slice of text.
- Trim file extensions or known prefixes.
Gotchas
- end is exclusive: slice(0, 3) returns 3 characters, indexes 0–2.
Try it live
Type your input and see Slice transform it instantly.
Want to go further? Chain Slice with other functions in the visual Playground — pipe one output into the next and watch your data transform.