Also pass index into predicate

README.md

@@ -30,7 +30,9 @@ console.log(odd); // [ 1, 3, 5, 7 ]
 Splits the `array` into a truthy and a falsy side, based on what the `predicate` function returns. Note that like `Array#map`, whether a value 'matches' depends on whether the returned value is [__truthy__](https://developer.mozilla.org/en-US/docs/Glossary/Truthy), not just a literal `true`.
 
 - __array:__ The array to split.
-- __predicate:__ The function that determines which side to sort the value into.
+- __predicate:__ The function that determines which side to sort the value into. This predicate function receives two arguments, of which you'll usually only need the first one:
+	- __value:__ The value itself.
+	- __index:__ The index of the value in the array you've provided.
 
 Returns an array with two elements:
 
@@ -38,3 +40,13 @@ Returns an array with two elements:
 - __1:__ The elements that __did not match__ the predicate function (ie. returned a falsy value).
 
 It's strongly recommended to use [array destructuring](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Destructuring_assignment#Array_destructuring) in handling the returned array (like in the example), as this will greatly improve readability of your code.
+
+## Changelog
+
+# 1.1.0 (August 19, 2019)
+
+- __New:__ Predicate function now also receives the index of the value as an argument, not just the value itself.
+
+# 1.0.0 (August 19, 2019)
+
+Initial release.

index.js

@@ -4,8 +4,8 @@ module.exports = function splitFilter(array, predicate) {
 	let truthy = [];
 	let falsy = [];
 
-	for (let item of array) {
-		if (predicate(item)) {
+	for (let [ i, item ] of array.entries()) {
+		if (predicate(item, i)) {
 			truthy.push(item);
 		} else {
 			falsy.push(item);