1
00:00:00,234 --> 00:00:04,534
[MUSIC]

2
00:00:04,534 --> 00:00:07,700
Hey everyone, I'm Guil, a friend and
teacher here at Treehouse.

3
00:00:07,700 --> 00:00:11,870
In this course, we're going to review
new features available in ES2015,

4
00:00:11,870 --> 00:00:14,985
the 6th edition of ECMAScript.

5
00:00:14,985 --> 00:00:19,540
ES2015 is the largest upgrade to
JavaScript since its creation.

6
00:00:19,540 --> 00:00:23,300
The language has new data types,
improved utility functions, and

7
00:00:23,300 --> 00:00:26,680
features to better define
the scope of your code blocks.

8
00:00:26,680 --> 00:00:29,450
Before we dive in,
let's review some of JavaScript's past.

9
00:00:30,450 --> 00:00:34,120
In 1995, there was something
called the browser wars.

10
00:00:34,120 --> 00:00:37,080
Netscape and
Microsoft were going head to head rapidly

11
00:00:37,080 --> 00:00:40,436
expanding their Web browsers'
capabilities and features.

12
00:00:40,436 --> 00:00:45,540
JavaScript was developed in just ten
days by Brendan Eich at Netscape.

13
00:00:45,540 --> 00:00:50,070
Its primary goal was to be a lightweight
interpreted language for non-programmers.

14
00:00:50,070 --> 00:00:54,410
To keep up, Microsoft later adopted the
language, calling their version JScript.

15
00:00:55,470 --> 00:01:00,490
By 1997, JavaScript was in every
browser and used by millions.

16
00:01:00,490 --> 00:01:05,310
The specification was then standardized by
an international standards organization,

17
00:01:05,310 --> 00:01:07,010
Ecma International.

18
00:01:07,010 --> 00:01:10,190
Because Netscape owned the name
JavaScript, Netscape and

19
00:01:10,190 --> 00:01:13,280
Microsoft agreed upon the name ECMAScript.

20
00:01:13,280 --> 00:01:18,000
ECMAScript and JavaScript are the same,
and you'll hear them used interchangeably.

21
00:01:18,000 --> 00:01:22,360
By the end of 1999,
ECMAScript 3 was standardized.

22
00:01:22,360 --> 00:01:26,520
It introduced things like regular
expressions and exception handling.

23
00:01:26,520 --> 00:01:28,410
Then in late 2009,

24
00:01:28,410 --> 00:01:32,770
ECMAScript 5 introduced a number of
useful features to the language.

25
00:01:32,770 --> 00:01:35,880
This version made JSON
a first-class citizen

26
00:01:35,880 --> 00:01:40,590
with the addition of several methods
that made using JSON a lot easier.

27
00:01:40,590 --> 00:01:41,535
Most importantly,

28
00:01:41,535 --> 00:01:45,160
JavaScript is the only programming
language native in web browsers.

29
00:01:45,160 --> 00:01:48,160
That's the main reason it's becoming
such a commonly used language.

30
00:01:48,160 --> 00:01:49,610
It's everywhere.

31
00:01:49,610 --> 00:01:52,220
JavaScript is changing, and as developers,

32
00:01:52,220 --> 00:01:55,710
we need to adapt to the exciting
changes offered in ES2015.

33
00:01:57,170 --> 00:02:02,190
Many browsers have adopted,
most if not all, of ES2015's features.

34
00:02:02,190 --> 00:02:05,380
Microsoft Edge, Apple Safari, Firefox, and

35
00:02:05,380 --> 00:02:09,370
Google's Chrome web browsers
are rapidly adopting ES2015 features.

36
00:02:10,450 --> 00:02:14,870
For a chart that shows the adoption
of ES2015 features in browsers,

37
00:02:14,870 --> 00:02:16,670
check out the teacher's notes.

38
00:02:16,670 --> 00:02:21,140
Because not all browsers yet support
ES2015, we can lean on tools like Babel

39
00:02:21,140 --> 00:02:25,960
to transpile our ES2015 code
into ES5 code for browsers.

40
00:02:25,960 --> 00:02:29,290
Now, we won't be using Babel in this
course, but you can check the teacher's

41
00:02:29,290 --> 00:02:33,050
notes for links to resources and
Treehouse videos on Babel.

42
00:02:33,050 --> 00:02:36,520
And the material in this course assumes
that you've completed the prerequisites

43
00:02:36,520 --> 00:02:37,500
for the course.

44
00:02:37,500 --> 00:02:39,210
And if you want to brush
up on your JavaScript,

45
00:02:39,210 --> 00:02:41,600
there's information in the teacher's
notes to help you out.

46
00:02:42,860 --> 00:02:47,620
In the next video, I'll show you the new
ways you can define a variable in ES2015

47
00:02:47,620 --> 00:02:50,320
with the let and const keywords.

48
00:02:50,320 --> 00:02:50,820
See you there.