There is a method in PHP called extract which does exactly what I want to do here. Say I have an object that looks like this:
var data = {
name: "Olly"
age: 19
};
I want to run a method like extract(data) so that I can then access the properties in that object by just using name and age, instead of data.name and data.age.
I've done a bit of Googling and couldn't find anything.
You can use something like this:
function myTestFunction() {
var data = {
name: "Olly",
age: 19,
};
for (var key in data) {
this[key] = data[key];
}
alert(name +" is "+ age +"!");
}
myTestFunction();
(Try that here: http://jsfiddle.net/dHDxd/3/)
Or even export them to global namespace, by using window[key] = data[key].
In any case, be very very careful with that, since the risk of clobbering the global namespace / override other stuff / etc. is very high.
extract()function extract(data, where) {
for (var key in data) {
where[key] = data[key];
}
}
function runTest() {
var myData = { name: "Olly", age: 19, };
extract(myData, this);
alert(name +" is "+ age +"!");
}
runTest();
extract(), not export() :)
this will be undefined in strict mode in that function, and will therefor throw an errorthis like you had, and then call the function with call, and specify the this value that way?
Here is more generic/multi-level/recurrent namespace extractor :)
function extract(rootObject, key) {
var parts = key.split('.');
var currentKey = parts.shift();
return parts.length > 0 ? extract(rootObject[currentKey], parts.join('.')) : rootObject[currentKey];
}
var myObject = { a: { b: { c: 7 }}};
console.log(extract(myObject, 'a.b.c'));
console.log(extract(myObject, 'a'));
withstatement is more closely similar to PHP'sextractmethod. That being said,withis not very common and I would not use it unless you truly understand how it works. See developer.mozilla.org/en/JavaScript/Reference/Statements/with