Definitions of Javascript: JS JAMZ #3

definitions

// Defintions

// Numbers
// 4, 5, 28, 1003, 42, 3.423

var meaningoflife = 42;
console.log(meaningoflife); // 42 - no quotations, no brackets, no squigglies, no nuthin'

// math operations

var three = 1 + 2; // addition
var five = 10 - 5; // subtraction
var ten = 5 * 2; // multiplication
var two = 4 / 2; // division

// String
// 'meaning of life'

var meaning = 'meaning of life';

// Basic operations 

var concat = 'meaning ' + 'of ' + 'life'; // 'meaning of life'
var length = meaning.length; // syntax: parent.length;
var position = meaning.indexOf('m'); // syntax: parent.indexOf(search); google MDN indexOf

// Two different ways of slicing string
// slice, substr

// syntax tax for slice
// parent.slice(beginning, end); 
console.log(meaning.slice(0, 2)); // 'mea'

// syntax for substr
// parent.substr(beginning, length);
console.log(meaning.subtstr(4, 10)); // 'ing of life'


// Objects
// syntax: var obj = { 'key' : value }

function checkAge(object) {
    return object['age'];
}

var laura = {
    'name' : 'Laura',
    'age' : 26,
    'personality' : ['Rule follower', 'Dominatrix'],
    'checkAge' : checkAge
};

var lauraAge = laura.checkAge(laura);
console.log(lauraAge); // 26

// Functions

function movieName(movie){
    return movie['name'];
}

var batman = {
    'name' : 'Batman Begins',
    'genre' : 'Action/Adventure'
}

var superman = {
    'name' : 'Man of Steel',
    'genre' : 'Action/Adventure'
}

var batTitle = movieName(batman); //Batman begins
var supTitle = movieName(superman);

// var batTitle = batman['name';]

function setVideoWidth() {
    var videos;
    
    videos = document.getElementsByTagName('video');
    // array of every video elements
    
    for (var i = 0; i < videos.length; i++) {
        videos[i].style.width = '100px';
    }
    
    return videos; // for logging purposes
}

var videoList = setVideoWdith();
// array of all videos on page



// Next time
// Recap: functions, arrays, objects
// Going over Loops
// You're going to get a similar quiz