How can I remove userid 2 from the following array using javascript
{"maxPages":2,"data":[{"UserId":"1","UserName":peterparker,"}{"UserId":"2","UserName":spiderman,"}]}
I was thinking of first getting the index like: id = 2 row = myarray.data.UserId.indexOf(id)
Then remove the row based on the index
var obj = {}; // ...your object
for ( var i = 0; i < obj.data.length ) {
if ( obj.data[i].UserId == 2 ) {
obj.data.splice(i, 1);
break;
}
}
obj.data[i].UserId == 2 not obj.data[i].UserId = 2
There are several possibilies:
Array#filter, which is slightly less efficient, but more convinient:
var obj = {"maxPages":2,"data":[{"UserId":"1","UserName":peterparker,"}{"UserId":"2","UserName":spiderman,"}]};
obj.data = obj.data.filter(function(v) { return v.UserId != 2 });
.filter() less efficient?
splice would need only to remove one element and shift remaining, which can be done without mem. allocations.splice is slow compared to other methods: jsperf.com/splice-vs-filtersplice performs a bit faster than built-in filter, thought hand-written filter (named push in testcase) is 4 times faster. Also I'm not sure about various compiler optimizations in this syntetic test case.The one of joellustigman works for me, but it has two little grammar corrections, the i++ and the "==" instead of "="
var obj = {
"maxPages":2,
"data":[{
"UserId":"1",
"UserName":"peterparker"
},
{"UserId":"2",
"UserName":"spiderman"
}
]}
for ( var i = 0; i < obj.data.length; i++ ) {
if ( obj.data[i].UserId == "2" ) {
obj.data.splice(i, 1);
break;
}
}
You can do this:
myarray.data = myarray.data.filter(function(item) {
return item.UserId !== 2;
});
deleteon array elements. Besides, is there not multiple syntax errors with this declaration?deletewith arrays. Usedeletewith objects, and usesplice()with arrays (or generate a new array)..lengthby1.