Update toKebabCase.md

snippets/toKebabCase.md

@@ -6,7 +6,7 @@ tags: string,regexp,intermediate
 Converts a string to kebab case.
 
 - Use `String.prototype.match()` to break the string into words using an appropriate regexp.
-- Use `Array.prototype.map()`, `Array.prototype.slice()`, `Array.prototype.join()` and `String.prototype.toLowerCase()` to combine them, adding `-` as a separator.
+- Use `Array.prototype.map()`, `Array.prototype.join()` and `String.prototype.toLowerCase()` to combine them, adding `-` as a separator.
 
 ```js
 const toKebabCase = str =>