I have an array of JSON objects like so:
var myArray = [
{name:'foo',number:2},
{name:'bar',number:9},
{etc.}
]
How do I detect if myArray contains an object with name="foo"?
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6Those are not JSON objectsQuentin– Quentin2011-05-06 22:15:27 +00:00Commented May 6, 2011 at 22:15
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4 Answers
Unless I'm missing something, you should use each at the very least for readability instead of map. And for performance, you should break the each once you've found what you're looking for, no reason to keep looping:
var hasFoo = false;
$.each(myArray, function(i,obj) {
if (obj.name === 'foo') { hasFoo = true; return false;}
});
Comments
With this:
$.each(myArray, function(i, obj){
if(obj.name =='foo')
alert("Index "+i + " has foo");
});
Cheers
answered May 6, 2011 at 22:11
Edgar Villegas Alvarado
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1 Comment
Felix Kling
Array.prototype.each does not exists. Either you mean $.each from jQuery or Array.prototype.forEach which is only supported by newer browsers.for(var i = 0; i < myArray.length; i++) {
if (myArray[i].name == 'foo')
alert('success!')
}
1 Comment
Felix Kling
Don't use
for...in to loop over an array.var hasFoo = false;
$.map(myArray, function(v) {
if (v.name === 'foo') { hasFoo = true; }
});
4 Comments
James Montagne
curious, why map instead of each?
mVChr
I just happened to be messing around with the new jQuery 1.6 map on objects and so this was the first thing that came to mind. Can't imagine there's a performance difference, just need to get over the sorrow of return values being lost to the ether.
James Montagne
won't somebody think of the poor orphans!
Felix Kling
The disadvantage is that you can not terminate the looping earlier (as opposed to
each).