Merge pull request #657 from yazeedb/add-reject

Add reject

snippets/reject.md

@@ -0,0 +1,12 @@
+### reject
+
+Takes a predicate and array, like `Array.filter()`, but only keeps `x` if `pred(x) === false`.
+
+```js
+const reject = (pred, array) => array.filter((...args) => !pred(...args));
+```
+
+```js
+reject(x => x % 2 === 0, [1, 2, 3, 4, 5]); // [1, 3, 5]
+reject(word => word.length > 4, ['Apple', 'Pear', 'Kiwi', 'Banana']); // ['Pear', 'Kiwi']
+```

tag_database

@@ -217,6 +217,7 @@ redirect:browser,url
 reducedFilter:array
 reduceSuccessive:array,function
 reduceWhich:array,function
+reject:array
 remove:array
 removeNonASCII:string,regexp
 renameKeys:object

test/reject/reject.js

@@ -0,0 +1,2 @@
+const reject = (pred, array) => array.filter((...args) => !pred(...args));
+module.exports = reject;

test/reject/reject.test.js

@@ -0,0 +1,24 @@
+const test = require('tape');
+const reject = require('./reject.js');
+
+test('Testing reject', (t) => {
+  //For more information on all the methods supported by tape
+  //Please go to https://github.com/substack/tape
+  t.true(typeof reject === 'function', 'reject is a Function');
+
+  const noEvens = reject(
+    (x) => x % 2 === 0,
+    [1, 2, 3, 4, 5]
+  );
+
+  t.deepEqual(noEvens, [1, 3, 5]);
+
+  const fourLettersOrLess = reject(
+    (word) => word.length > 4,
+    ['Apple', 'Pear', 'Kiwi', 'Banana']
+  );
+
+  t.deepEqual(fourLettersOrLess, ['Pear', 'Kiwi']);
+
+  t.end();
+});