Simplify findLastIndex

snippets/findLastIndex.md

@@ -3,14 +3,14 @@
 Returns the index of the last element for which the provided function returns a truthy value.
 
 Use `Array.map()` to map each element to an array with its index and value.
-Use `Array.filter()` to remove elements for which `fn` returns falsey values, `Array.slice(-1)` to get the last one.
+Use `Array.filter()` to remove elements for which `fn` returns falsey values, `Array.pop()` to get the last one.
 
 ```js
 const findLastIndex = (arr, fn) =>
   arr
     .map((val, i) => [i, val])
-    .filter(val => fn(val[1], val[0], arr))
+    .filter(([i, val]) => fn(val, i, arr))
-    .slice(-1)[0][0];
+    .pop()[0];
 ```
 
 ```js

test/findLastIndex/findLastIndex.js

@@ -1,6 +1,6 @@
 const findLastIndex = (arr, fn) =>
 arr
 .map((val, i) => [i, val])
-.filter(val => fn(val[1], val[0], arr))
+.filter(([i, val]) => fn(val, i, arr))
-.slice(-1)[0][0];
+.pop()[0];
 module.exports = findLastIndex;