How can you query an object with an array?
var myArray = ['A','C']
Using myArray, how can I get a returned array with ['1','3'] out of the following (previously JSON object) (without using a third party query script -- unless it's jQuery :)
[ { "property1": "1",
"property2": "A"
},
{ "property1": "2",
"property2": "B"
},
{ "property1": "3",
"property2": "C"
} ]
You could a nested loop:
var myArray = ['A','C'];
var json = [{
'property1': '1',
'property2': 'A'
}, {
'property1': '2',
'property2': 'B'
}, {
'property1': '3',
'property2': 'C'
}];
var result = new Array();
for (var i = 0; i < myArray.length; i++) {
for (var j = 0; j < json.length; j++) {
if (json[j].property2 === myArray[i]) {
result.push(json[j].property1);
}
}
}
// at this point result will contain ['1', '3']
You can walk the array like this:
var json = [ { "property1": "1",
"property2": "A"
},
{ "property1": "2",
"property2": "B"
},
{ "property1": "3",
"property2": "C"
} ];
var myArray = ['A', 'C']; // Here is your request
var resultArray = []; // Here is the container for your result
// Walking the data with an old-fashioned for loop
// You can use some library forEach solution here.
for (var i = 0, len = json.length; i < len; i++) {
var item = json[i]; // Caching the array element
// Warning! Not all browsers implement indexOf, you may need to use a library
// or find a way around
if (myArray.indexOf(item.property2) !== -1) {
resultArray.push(item.property1);
}
}
console.log(resultArray);
indexOf part. I'm really surprised how close it is to Emile's answer, because I didn't see his solution prior to answering this question.