Initial commit

.gitignore

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+node_modules
+components
+build

Makefile

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+
+build: components
+		@component build --dev
+
+clean:
+		@rm -rf node_modules build components
+
+components: component.json
+		@component install --dev
+
+node_modules: package.json
+		@npm install
+
+test: node_modules build
+		@./node_modules/.bin/mocha --reporter spec
+		@component test phantom
+
+.PHONY: clean test

Readme.md

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+
+# Filter
+
+  Iterate over elements of a collection, and return an array of all elements the predicate returns truthy for.
+
+## Installation
+
+    $ component install harrietgrace/filter
+    $ npm install harrietgrace/filter
+
+## License
+
+  MIT

component.json

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+{
+  "name": "filter",
+  "version": "0.1.0",
+  "repo": "harrietgrace/filter",
+  "description": "Iterate over elements of a collection, and return an array of all elements the predicate returns truthy for.",
+  "keywords": [],
+  "license": "MIT",
+  "main": "lib/index.js",
+  "scripts": [
+    "lib/index.js"
+  ],
+  "dependencies": {},
+  "development": {
+    "component/assert": "*"
+  }
+}

lib/index.js

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+/**
+ * Expose `filter`.
+ */
+
+module.exports = filter;
+
+/**
+ * Return an array of all elements the predicate returns truthy for.
+ *
+ * @param {Array|Object|String} collection
+ * @param {Function} predicate
+ * @return {Array}
+ */
+
+function filter(collection, predicate){
+  var results = [];
+
+  if (collection == null) return results;
+
+  for (var i = 0; i < collection.length; i +=1) {
+    if (predicate(collection[i])) results.push(collection[i]);
+  }
+
+  return results;
+}

package.json

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+{
+  "name": "filter",
+  "version": "0.1.0",
+  "repository": "git://github.com/harrietgrace/filter.git",
+  "description": "Iterate over elements of a collection, and return an array of all elements the predicate returns truthy for.",
+  "keywords": [],
+  "license": "MIT",
+  "main": "lib/index.js",
+  "dependencies": {},
+  "devDependencies": {
+    "mocha": "1.x"
+  }
+}

test/index.js

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+try {
+  var filter = require('filter');
+} catch (e) {
+  var filter = require('..');
+}
+
+var assert = require('assert');
+
+describe('filter', function(){
+  it('should return the filtered keys', function(){
+    var arr = [ 1, 2, 3, 4, 5 ];
+    assert.deepEqual(
+      [ 2, 4 ],
+      filter(arr, function(value){ if( value == 2 || value == 4 ) return value; })
+    );
+  });
+
+  it('should return an empty array', function(){
+    var arr = [ 1, 2, 3, 4, 5 ];
+    assert.deepEqual(
+      [],
+      filter(arr, function(value){ if( value == 'a' ) return value; })
+    );
+  });
+
+  it('should return all the elements', function(){
+    var arr = [ 1, 2, 3, 4, 5 ];
+    assert.deepEqual(
+      [ 1, 2, 3, 4, 5 ],
+      filter(arr, function(value){ if( value ) return value; })
+    );
+  });
+});