10 JavaScript array functions

index.js

/**
 * 10 JavaScript array functions
 *
 * Insert
 * - push
 *
 * Retrieve/Search
 * - filter
 * - find
 * - includes(item) || includes(item, index)
 *
 * Update
 * - [...spread]
 * - arr.slice(start, end)
 *
 * Remove
 * - pop
 *
 * Transform
 * - map
 * - reverse
 *
 * Loops/Iteration
 * - forEach
 */

const languages = ['javascript', 'python', 'ruby', 'java', 'csharp'];
// [ 'javascript', 'python', 'ruby', 'java', 'csharp' ]

languages.push('go');
// [ 'javascript', 'python', 'ruby', 'java', 'csharp', 'go' ]

const languagesNotJava = languages.filter((language) => language !== 'java');
// [ 'javascript', 'python', 'ruby', 'csharp', 'go' ]

const languagePython = languages.find((language) => language === 'python');
// python

const languagesHasJava = languages.includes('java');
// true
const languagesHasJavascript = languages.includes('javascript', 1);
// false

let newLanguages = [...languages, 'c', 'c++'];
// [ 'javascript', 'python', 'ruby', 'java', 'csharp', 'go', 'c', 'c++' ]

newLanguages = newLanguages.slice(0);
// [ 'javascript', 'python', 'ruby', 'java', 'csharp', 'go', 'c', 'c++' ]
newLanguages = newLanguages.slice(1);
// [ 'python', 'ruby', 'java', 'csharp', 'go', 'c', 'c++' ]
newLanguages = newLanguages.slice(0, -1);
// [ 'python', 'ruby', 'java', 'csharp', 'go', 'c' ]
newLanguages = newLanguages.slice(-1);
// [ 'c' ]

languages.pop();
// ['javascript', 'python', 'ruby', 'java', 'csharp'];

const fruits = ['🍌', '🍋', '🍎'];

const apples = fruits.map((fruit) => '🍎');
// [ '🍎', '🍎', '🍎' ]

const fruitsReverse = [...fruits].reverse((fruit) => fruit);
// [ '🍎', '🍋', '🍌' ]

fruits.forEach((fruit) => console.log(fruit));
// 🍌
// 🍋
// 🍎