Suppose there is a JavaScript array
myArray = {
"key1" : value1
...
"keyn" : valuen
}
My question is, can I find the integer index corresponding to, say, "key1" ?
I need both the value and the its integer position in the array!
3 Answers
No.
That is an object, not an array.
Object keys are unordered.
Comments
@Slaks is correct, but maybe you can fudge it:
for(var key in myArray) {
var sudoIndex = +key.match(/\d+/g)[0],
value = myArray[key];
// do stuff
}
This assumes your keys are numbered like in your example.
2 Comments
eternalthinker
I used the
for in and checked each property, while simultaneously incrementing an integer. The properties are iterated in desired order since I gave them in alphabetical order!
outis
@eternalthinker: properties aren't guaranteed to preserve any particular order. Though you may have seen this in your limited tests, in other browsers (or other instances for the same browser), the behavior may be different. If you need properties to be ordered, you'll need to store the order in a separate data structure, such as an array containing the property names.
For getting value you can do:
console.log(myArray.key1);
for initeration, but the properties wouldn't be guaranteed to come in the same order each time.