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snippets/array-includes.md

@@ -1,10 +1,10 @@
 ### Array includes
 
-Use `slice()` to offset the array/string. `Array.indexOf()` returns `-1` if the sub-string/array dosen't contain the given `value`.
+Use `slice()` to offset the array/string and `indexOf()` to check if the value is included.
+Omit the last argument, `fromIndex`, to check the whole array/string.
 
 ```js
 const includes = (collection, val, fromIndex=0) => collection.slice(fromIndex).indexOf(val) != -1;
-
 // includes("30-seconds-of-code", "code") -> true
 // includes([1, 2, 3, 4], [1, 2], 1) -> false
-```
+```