Le 15/03/2014 01:32, Brandon Benvie a écrit :
On 3/14/2014 5:16 PM, Mark Volkmann wrote:
Does ES6 add any new ways to iterate over the values in an object?
I've done a lot of searching, but haven't seen anything.
I'm wondering if there is something more elegant than this:
Object.keys(myObj).forEach(function (key) {
let obj = myObj[key];
// do something with obj
});
Not built in, but ES6 does provide a better story for this using
generators and for-of:
```js
// using a generator function
function* entries(obj) {
for (let key of Object.keys(obj)) {
yield [key, obj[key]];
}
}
// an alternative version using a generator expression
function entries(obj) {
return (for (key of Object.keys(obj)) [key, obj[key]]);
}
for (let [key, value] of entries(myObj)) {
// do something with key|value
}
```
Currently, there is no default Object.prototype.@@iterator, so
for-of'ing over an object throws a TypeError which isn't really a useful
default.
No having a default @@iterator also makes that Map({a:1, b:2}) throws
which is unfortunate.
Should what you just wrote be made the default
Object.prototype.@@iterator? It is compatible with the signature the Map
constructor expects too.
David
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