fix: correctly return nth last entry when passing second argument

Author: joakimunge

README.md

@@ -11,7 +11,7 @@ $ yarn add array-last
 ## Usage
 
 ```javascript
-const last = require('array-last');
+const last = require('array-nth-last');
 
 const arr = [1, 2, 3, 4, 5];
 

index.js

@@ -2,7 +2,8 @@ function nthLast(array, n = 0) {
   if (!Array.isArray(array)) {
     throw new Error('First argument must be an array');
   }
-  return array[array.length - (1 + n)];
+
+  return n === 0 ? array[array.length - (1 + n)] : array[array.length - n];
 }
 
 module.exports = nthLast;

test.js

@@ -10,7 +10,7 @@ test('last', t => {
 test('3rd last', t => {
   const arr = [1, 2, 3, 4, 5, 6, 7, 8, 9];
   const lastEntry = nthLast(arr, 2);
-  t.is(lastEntry, 7);
+  t.is(lastEntry, 8);
 });
 
 test('Invalid argument', t => {