JavaScript Starts with
startsWith() returns true if the string begins with the characters you pass, and false otherwise. An optional second argument lets you start the check at a given position. Case-sensitive.
Syntax
str.startsWith(search)Examples
| Input | Arguments | Output |
|---|---|---|
| "hello world" | "hello" | true |
| "hello" | "H" | false |
| ↳ Case-sensitive. | ||
When to use it
- Route or branch on URL prefixes.
- Detect protocols like "https://".
Gotchas
- Case-sensitive — normalise case first if needed.
Try it live
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Want to go further? Chain Starts with with other functions in the visual Playground — pipe one output into the next and watch your data transform.