first commit

.gitignore

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+node_modules
+coverage

.travis.yml

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+language: node_js
+node_js:
+  - 'iojs'
+  - '0.10'
+  - '0.12'
+before_install:
+  - npm i -g gulp
+after_success:
+  - gulp coveralls

LICENSE

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+The MIT License (MIT)
+
+Copyright (c) 2015 Javier Cejudo <javier@javiercejudo.com> (http://www.javiercejudo.com)
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.

README.md

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+# every-against-first
+
+[![Build Status](https://travis-ci.org/javiercejudo/every-against-first.svg)](https://travis-ci.org/javiercejudo/every-against-first)
+[![Coverage Status](https://coveralls.io/repos/javiercejudo/every-against-first/badge.svg?branch=master)](https://coveralls.io/r/javiercejudo/every-against-first?branch=master)
+[![Code Climate](https://codeclimate.com/github/javiercejudo/every-against-first/badges/gpa.svg)](https://codeclimate.com/github/javiercejudo/every-against-first)
+
+Test every element in array against the first
+
+## Install
+
+    npm i every-against-first
+
+## Usage
+
+```js
+var everyAgainstFirst = require('every-against-first');
+
+
+```
+
+See more examples of [fixture callbacks](fixtures/callbacks.js).

fixtures/callbacks.js

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+/*jshint node:true, mocha:true */
+
+'use strict';
+
+module.exports = {
+  isAscendingPair: isAscendingPair,
+  isAscendingAbsValue: isAscendingAbsValue,
+  isConsecutive: isConsecutive
+};
+
+
+function isAscendingPair(a, b) {
+  return b > a;
+}
+
+function isAscendingAbsValue(a, b) {
+  return this.abs(b) > this.abs(a);
+}
+
+function isConsecutive(a, x, index, array) {
+  return a + index === x && a + index === array[index - 1];
+}

gulpfile.js

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+var gulp = require('gulp');
+var mocha = require('gulp-mocha');
+var istanbul = require('gulp-istanbul');
+var rimraf = require('rimraf');
+var coveralls = require('gulp-coveralls');
+
+gulp.task('clean', function (cb) {
+  rimraf('./coverage', cb);
+});
+
+gulp.task('instrument', function () {
+  return gulp.src(['src/*.js'])
+    .pipe(istanbul())
+    .pipe(istanbul.hookRequire());
+});
+
+gulp.task('test', ['clean', 'instrument'], function () {
+  return gulp.src(['test/*.js'])
+    .pipe(mocha())
+    .pipe(istanbul.writeReports());
+});
+
+gulp.task('coveralls', function () {
+  gulp.src('coverage/lcov.info')
+    .pipe(coveralls());
+});
+
+gulp.task('default', ['test']);

package.json

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+{
+  "name": "every-against-first",
+  "version": "0.0.0",
+  "description": "Test every element in array against the first",
+  "main": "src/everyAgainstFirst.js",
+  "scripts": {
+    "test": "gulp test"
+  },
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/javiercejudo/every-against-first"
+  },
+  "keywords": [
+    "all",
+    "array",
+    "every"
+  ],
+  "author": "Javier Cejudo",
+  "license": "MIT",
+  "bugs": {
+    "url": "https://github.com/javiercejudo/every-against-first/issues"
+  },
+  "homepage": "https://github.com/javiercejudo/every-against-first",
+  "devDependencies": {
+    "gulp": "^3.8.11",
+    "gulp-coveralls": "^0.1.3",
+    "gulp-istanbul": "^0.6.0",
+    "gulp-mocha": "^2.0.0",
+    "rimraf": "^2.3.2",
+    "should": "^5.0.0"
+  }
+}

src/everyAgainstFirst.js

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+'use strict';
+
+module.exports = function everyAgainstFirst(array, callback, thisArg) {
+  var first = array.shift();
+
+  return array.every(function (current, index) {
+    return callback.call(thisArg, first, current, index + 1, array);
+  });
+};

test/index.js

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+'use strict';
+
+require('should');
+
+var everyAgainstFirst = require('../src/everyAgainstFirst.js');
+var fixtures = require('../fixtures/callbacks');
+
+describe('every-against-first', function () {
+  it('should execute test for the every element against the first', function () {
+    everyAgainstFirst([5, 7, 10], fixtures.isAscendingPair).should.be.exactly(true);
+    everyAgainstFirst([5, 7, 4], fixtures.isAscendingPair).should.be.exactly(false);
+  });
+
+  it('should return true when array is shorter than 2', function () {
+    everyAgainstFirst([1], fixtures.isAscendingPair).should.be.exactly(true);
+    everyAgainstFirst([], fixtures.isAscendingPair).should.be.exactly(true);
+  });
+
+  it('should pass index and array to the callback', function () {
+    everyAgainstFirst([1, 2, 3, 4], fixtures.isConsecutive).should.be.exactly(true);
+  });
+
+  it('should execute the callback with the provided thisArg as this', function () {
+    everyAgainstFirst([3, -5], fixtures.isAscendingAbsValue, Math).should.be.exactly(true);
+    everyAgainstFirst([-3, -2], fixtures.isAscendingAbsValue, Math).should.be.exactly(false);
+  });
+});