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https://github.com/yosuke-furukawa/iojs-new-features
iojs v3.0 released.
https://github.com/yosuke-furukawa/iojs-new-features
Last synced: 4 months ago
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iojs v3.0 released.
- Host: GitHub
- URL: https://github.com/yosuke-furukawa/iojs-new-features
- Owner: yosuke-furukawa
- Created: 2015-04-29T11:53:04.000Z (almost 10 years ago)
- Default Branch: master
- Last Pushed: 2015-08-07T17:44:04.000Z (over 9 years ago)
- Last Synced: 2024-10-14T01:24:40.635Z (4 months ago)
- Language: JavaScript
- Homepage:
- Size: 164 KB
- Stars: 39
- Watchers: 6
- Forks: 2
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
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- awesome-github-repos - yosuke-furukawa/iojs-new-features - iojs v3.0 released. (JavaScript)
README
# io.js v3.0 is released!!!!!!!
io.js v3.0 new features.
# ECMAScript 2015 - feature
current V8 version 4.4
previous V8 version 4.2
If you would like to see the changes, see [the following url](https://gist.github.com/rvagg/1f115074cb3c890985bf)
https://gist.github.com/rvagg/1f115074cb3c890985bf
## Computed property names
Computed property names (`{['foo'+'bar']:'bam'}`) are shipped.
No need to specify any `harmony-` flag.
```javascript
var i = 0;
var a = {
["foo" + ++i]: i,
["foo" + ++i]: i,
["foo" + ++i]: i
};
console.log(a.foo1); // 1
console.log(a.foo2); // 2
console.log(a.foo3); // 3
var param = 'size';
var config = {
[param]: 12,
["mobile" + param.charAt(0).toUpperCase() + param.slice(1)]: 4
};
console.log(config);
```
```
$ iojs es6/computed_property/computedProps.js
```
## unicode
Unicode escape sequence (`\u{xxxxx}`) is shipped.
No need to specify `--harmony` option.
```javascript
console.log('\u{1F363}'); // 🍣
console.log('\u{1F4A1}'); // 💡
```
```
$ iojs es6/unicode/unicode.js
```
## Array subclass
class is already available, but previous version does not support built-in Array subclass.
note: we should put 'use strict' on top.
```javascript
// strict mode needed
'use strict';
class ShuffleArray extends Array {
shuffle() {
var l = this.length;
var i;
var t;
while (l) {
i = Math.floor(Math.random() * l--);
t = this[l];
this[l] = this[i];
this[i] = t;
}
return this;
}
}
var shuffleArray = new ShuffleArray();
shuffleArray.push(1, 2, 3, 4, 5, 6);
console.log(shuffleArray.shuffle()); // shuffled [4, 6, 3, 1, 5, 2]
```
previous io.js is also available Array subclass. But they have an [issue](https://code.google.com/p/v8/issues/detail?can=2&q=3930&colspec=ID%20Type%20Status%20Priority%20Owner%20Summary%20HW%20OS%20Area%20Stars&id=3930). v8 fixed the problem.
## Spread operator
Now, we can use `Spread operator (...) `.
But we need to specify `--es_staging` arguments.
The spread operator allows an expression to be expanded in places where multiple arguments (for function calls) or multiple elements (for array literals) are expected.
```javascript
// Spread operator
var arr1 = [0, 1, 2];
var arr2 = [3, 4, 5];
arr1.push(...arr2); // we can use ...
console.log(arr1);
```
```
$ node --es_staging es6/spread_operator/spread.js
```
## Rest parameters
Rest parameters (`function(...args) {}`) are implemented in staging behind the `--es-staging` flag.
```javascript
// Rest parameters
function max(...args) {
// rest parameter is not Array-like object, that is just array.
console.log(Array.isArray(args)) // true
console.log(args.length) // 6
var max = args.reduce(function(max, n) {
return n > max ? n : max;
});
return max;
}
var maxNum = max(5, 15, 10, 1, 4, 5);
console.log(maxNum); // 15
```
```
$ iojs --es_staging es6/rest_params/rest.js
```
# REPL saves history by default
REPL gets a history file.
In previous version, repl needs to specify `NODE_REPL_HISTORY_FILE`.
But current version, repl saves history by default.
```
$ iojs
> var fs = require('fs');
# Ctrl-D
$ iojs
> var fs = require('fs'); # push up button
```
# Buffer is subclass of Uint8Array
```javascript
const Buffer = require('buffer').Buffer;
const ab = new ArrayBuffer(16);
var buf = new Buffer(ab); // Buffer constructor accepts ArrayBuffer.
console.log(buf instanceof Uint8Array); // true
console.log(buf instanceof Buffer); // true
buf.writeUInt32BE(0x61626364, 0);
console.log(buf.toString()); //abcd
```
# Remove smalloc and Deprecate freelist
`smalloc` module is removed.
`freelist` module is now deprecated.
# Want to know more??
please check the following issue.
https://github.com/nodejs/io.js/blob/master/CHANGELOG.md#2015-08-04-version-300-rvagg
https://github.com/nodejs/io.js/wiki/Breaking-Changes#300-from-2x