I was wondering if there's a way to do something like a PHP foreach
loop in JavaScript. The functionality I'm looking for is something like this PHP Snippet:
foreach($data as $key => $value) { }
I was looking at the JS for..in
loop, but there seems to be no way to specify the as
. If I do this with a 'normal' for loop (for(var i = 0; i < data.length; i++
), is there a way to grab the key => value pairs?
for (var k in target){
if (target.hasOwnProperty(k)) {
alert("Key is " + k + ", value is " + target[k]);
}
}
hasOwnProperty
is used to check if your target
really has that property, rather than having inherited it from its prototype. A bit simpler would be:
for (var k in target){
if (typeof target[k] !== 'function') {
alert("Key is " + k + ", value is" + target[k]);
}
}
It just checks that k
is not a method (as if target
is array
you'll get a lot of methods alerted, e.g. indexOf
, push
, pop
,etc.)