JavaScript. Like PHP, JavaScript is a modern programming language that is derived from the syntax at C.
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2 Like PHP, JavaScript is a modern programming language that is derived from the syntax at C. It has been around just about as long as PHP, also having been invented in JavaScript, HTML, and CSS make up the three languages defining most of the user experience on the web.
3 To start writing JavaScript, open up a file with the.js file extension. No need for any code delimiters like we had in PHP. Our website will know that our file is JavaScript because we ll explicitly tell it as much in an HTML tag. Unlike PHP which runs server-side, JavaScript applications run client-side, on your own machine.
4 Including JavaScript in your HTML Just like CSS with <style> tags, you can directly write your JavaScript between <script> tags. Just like CSS with <link> tags, you can write your JavaScript in separate files and link them in by using the src attribute of the <script> tag.
5 Including JavaScript in your HTML Just like CSS with <style> tags, you can directly write your JavaScript between <script> tags. Just like CSS with <link> tags, you can write your JavaScript in separate files and link them in by using the src attribute of the <script> tag.
6 Variables JavaScript variables are similar to PHP variables. No type specifier. When a local variable is first declared, preface with the var keyword.
7 Variables JavaScript variables are similar to PHP variables. No type specifier. When a local variable is first declared, preface with the var keyword. $x = 44;
8 Variables JavaScript variables are similar to PHP variables. No type specifier. When a local variable is first declared, preface with the var keyword. $x = 44;
9 Variables JavaScript variables are similar to PHP variables. No type specifier. When a local variable is first declared, preface with the var keyword. var x = 44;
10 Conditionals All of the old favorites from C are still available for you to use. if
11 Conditionals All of the old favorites from C are still available for you to use. if else if
12 Conditionals All of the old favorites from C are still available for you to use. if else if else
13 Conditionals All of the old favorites from C are still available for you to use. if else if else switch
14 Conditionals All of the old favorites from C are still available for you to use. if else if else switch?:
15 Loops All of the old favorites from C are still available for you to use.
16 Loops All of the old favorites from C are still available for you to use. while
17 Loops All of the old favorites from C are still available for you to use. while do-while
18 Loops All of the old favorites from C are still available for you to use. while do-while for
19 Functions All functions are introduced with the function keyword. JavaScript functions, particularly those bound specifically to HTML elements, can be anonymous you don t have to give them a name! We ll revisit anonymity a little later, and we ll revisit binding to HTML elements in the video on the Document Object Model.
20 Arrays Declaring an array is pretty straightforward.
21 Arrays Declaring an array is pretty straightforward. var nums = [1, 2, 3, 4, 5];
22 Arrays Declaring an array is pretty straightforward. var nums = [1, 2, 3, 4, 5]; var mixed = [1, true, 3.333, five ];
23 Objects JavaScript has the ability to behave as an object-oriented programming language. By contrast, C is a functional programming language. JavaScript can behave like a functional programming language, too. An object is sort of analogous to a C structure.
24 Objects C structures contain a number of fields, which we might also call properties. But the properties themselves can not ever stand on their own.
25 Objects struct car { int year; char model[10]; } C structures contain a number of fields, which we might also call properties. But the properties themselves can not ever stand on their own.
26 Objects struct car { int year; char model[10]; } C structures contain a number of fields, which we might also call properties. But the properties themselves can not ever stand on their own. struct car herbie;
27 Objects struct car { int year; char model[10]; } C structures contain a number of fields, which we might also call properties. But the properties themselves can not ever stand on their own. struct car herbie; herbie.year = 1963; herbie.model = Beetle ;
28 Objects struct car { int year; char model[10]; } C structures contain a number of fields, which we might also call properties. But the properties themselves can not ever stand on their own. struct car herbie; year = 1963; model = Beetle ;
29 Objects struct car { int year; char model[10]; } C structures contain a number of fields, which we might also call properties. But the properties themselves can not ever stand on their own. struct car herbie; year = 1963; model = Beetle ;
30 Objects C structures contain a number of fields, which we might also call properties. But the properties themselves can not ever stand on their own. Objects, meanwhile, have properties but also methods, or functions that are inherent to the object, and mean nothing outside of it. Thus, like properties can methods not ever stand on their own.
31 Objects function(object);
32 Objects function(object);
33 Objects object.function();
34 Objects The fields and methods of an object are similar in spirit to the idea of an associative array, with which we re familiar from PHP.
35 Objects The fields and methods of an object are similar in spirit to the idea of an associative array, with which we re familiar from PHP. var herbie = {year : 1963, model: Beetle };
36 Loops (redux) How do we iterate across all of the key-value pairs of an object (or indeed, all of the elements of an array)?
37 Loops (redux) How do we iterate across all of the key-value pairs of an object (or indeed, all of the elements of an array)? foreach($array as $key) { // use $key in here as a stand-in for $array[$i] }
38 Loops (redux) How do we iterate across all of the key-value pairs of an object (or indeed, all of the elements of an array)? foreach($array as $key) { // use $key in here as a stand-in for $array[$i] }
39 Loops (redux) How do we iterate across all of the key-value pairs of an object (or indeed, all of the elements of an array)? for (var key in object) { // use object[key] in here }
40 Loops (redux) How do we iterate across all of the key-value pairs of an object (or indeed, all of the elements of an array)? for (var key of object) { // use key in here }
41 Loops (redux) var wkarray = [ Monday, Tuesday, Wednesday, Thursday, Friday, Saturday, Sunday ];
42 Loops (redux) var wkarray = [ Monday, Tuesday, Wednesday, Thursday, Friday, Saturday, Sunday ]; for (var day in wkarray) { console.log(day); }
43 Loops (redux) var wkarray = [ Monday, Tuesday, Wednesday, Thursday, Friday, Saturday, Sunday ]; for (var day of wkarray) { console.log(day); }
44 Printing and variable interpolation console.log(wkarray[day]. is day number. (day + 1). of the week! );
45 Printing and variable interpolation console.log(wkarray[day] + is day number + (day + 1) + of the week! );
46 Printing and variable interpolation console.log(wkarray[day] + is day number + (day + 1) + of the week! );
47 Printing and variable interpolation console.log(wkarray[day] + is day number + (parseint(day) + 1) + of the week! );
48 Functions (redux) Arrays are a special case of an object (in fact, everything in JavaScript is a special case of an object), and has numerous methods that can applied to them: array.size(), array.pop(), array.push(x), array.shift(); There is also a method for arrays called map(), which can be used to apply a function to all elements of an array. A great situation to use an anonymous function
49 Functions (redux) var nums = [1, 2, 3, 4, 5];
50 Functions (redux) var nums = [1, 2, 3, 4, 5]; nums = nums.map(function(num) { return num * 2; });
51 Functions (redux) var nums = [1, 2, 3, 4, 5]; nums = nums.map(function(num) { return num * 2; });
52 Functions (redux) var nums = [2, 4, 6, 8, 10]; nums = nums.map(function(num) { return num * 2; });
53 Events An event in HTML and JavaScript is a response to user interaction with the web page. A user clicks a button, a page has finished loading, a user has hovered over a portion of the page, the user typed in an input field. JavaScript has support for event handlers, which are callback functions that respond to HTML events. Many HTML elements have support for events as an attribute.
54 <html> </html> <head> </head> <body> <title>event Handlers</title> <button onclick= >Button 1</button> <button onclick= >Button 2</button> </body>
55 <html> </html> <head> </head> <body> <title>event Handlers</title> <button onclick= >Button 1</button> <button onclick= >Button 2</button> </body>
56 Events We can write a generic event handler in JavaScript, creating an event object, that will tell us which of these two buttons was clicked.
57 <html> </html> <head> </head> <body> <title>event Handlers</title> <button onclick= alertname(event) >Button 1</button> <button onclick= alertname(event) >Button 2</button> </body>
58 function alertname(event) { var trigger = event.srcelement; alert( You clicked on + trigger.innerhtml); }
59 function alertname(event) { var trigger = event.srcelement; alert( You clicked on + trigger.innerhtml); }
60 function alertname(event) { var trigger = event.srcelement; alert( You clicked on + trigger.innerhtml); }
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