even index array

.gitignore

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+node_modules/

README.md

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+# even-index
+Returns an array with items evenly indexed
+
+![npm](https://img.shields.io/npm/v/even-index.svg) ![license](https://img.shields.io/npm/l/even-index.svg) ![github-issues](https://img.shields.io/github/issues/Prosen-Ghosh/even-index.svg)
+
+
+![travis-status](https://img.shields.io/travis/Prosen-Ghosh/even-index.svg)
+![stars](https://img.shields.io/github/stars/Prosen-Ghosh/even-index.svg)
+![forks](https://img.shields.io/github/forks/Prosen-Ghosh/even-index.svg)
+
+## Features
+
+
+## `npm` Install
+
+`npm install --save even-index`
+
+
+## Script Tag
+
+#### For Development
+```js
+<script src=""></script>
+```
+#### For Production
+```js
+<script src=""></script>
+```
+
+## Usage
+
+```js
+
+const evenIndex = require('even-index');
+
+evenIndex([]);
+//=> []
+
+evenIndex([1]);
+//=> [ 1 ]
+
+evenIndex([1,-10]);
+//=> [ 1 ]
+
+evenIndex([1,-10,45]);
+//=> [ 1, 45 ]
+
+evenIndex(["foo","baz","bar","bob","tim"]);
+//=> [ 'foo', 'bar', 'tim' ]
+
+evenIndex(["foo","baz","bar",{a : 10},[10,20,30]]);
+//=> [ 'foo', 'bar', [ 10, 20, 30 ] ]
+
+evenIndex(["foo","baz","bar",[10,30],function(){}]);
+//=> [ 'foo', 'bar', [Function] ]
+
+evenIndex(); // without parameter this function will return a type error
+//=> TypeError: expect an array got undefined
+
+evenIndex({}); // this function only expect an array
+//=> TypeError: expect an array got object
+
+```
+
+## Author
+
+Prosen Ghosh <[email protected]> (https://bd.linkedin.com/in/prosen-ghosh-baba9aa8)
+
+## License
+
+ - **MIT**

even-index.js

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+const evenIndex = (function(){
+ 'use strict';
+ const fn = function(arr){
+ if(Object.prototype.toString.call(arr).toLowerCase() !== '[object array]')throw new TypeError('expect an array got ' + typeof arr);
+ return arr.reduce((p,c,i) => {
+ if(!(i&1))p.push(c);
+ return p;
+ },[]);
+ }
+ return fn;
+})();
+
+if (typeof module === 'object' && module.exports) {
+ module.exports = evenIndex;
+}

package.json

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+{
+ "name": "even-index",
+ "version": "1.0.0",
+ "description": "Returns an array with items evenly indexed",
+ "main": "even-index.js",
+ "directories": {
+ "test": "test"
+ },
+ "scripts": {
+ "test": "mocha",
+ "readme": "node ./node_modules/.bin/node-readme"
+ },
+ "repository": {
+ "type": "git",
+ "url": "git+https://github.com/Prosen-Ghosh/even-index.git"
+ },
+ "keywords": [
+ "even",
+ "number",
+ "array",
+ "index",
+ "elements"
+ ],
+ "author": "Prosen Ghosh <[email protected]> (https://bd.linkedin.com/in/prosen-ghosh-baba9aa8)",
+ "license": "MIT",
+ "bugs": {
+ "url": "https://github.com/Prosen-Ghosh/even-index/issues"
+ },
+ "homepage": "https://github.com/Prosen-Ghosh/even-index#readme",
+ "devDependencies": {
+ "chai": "^4.1.2",
+ "mocha": "^4.0.0",
+ "node-readme": "^0.1.9"
+ }
+}

test/test.js

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+const evenIndex = require('../even-index');
+const assert = require('chai').assert;
+describe('Even Index Array',function(){
+ it('Function Shuld Return Even Index Of Array from the orginal array',function(){
+ assert.deepEqual(evenIndex([1]),[1]);
+ assert.deepEqual(evenIndex([]),[]);
+ assert.deepEqual(evenIndex([-2,-1]),[-2]);
+ assert.deepEqual(evenIndex([[],-2,[]]),[[],[]]);
+ assert.deepEqual(evenIndex(["foo","baz","jam","bar","bob"]),["foo","jam","bob"]);
+ });
+});