What is the best method for filtering a JavaScript array of objects based on a specific key-value pair?
For example: I am interested in selecting items by their color from the array below:
[{Id:1, color:"blue"},{Id:2, color:"green"},{Id:3, color:"blue"},{Id:4, color:"red"}]
While it is simple to select items by property in languages like CSS or xslt, I am struggling to find an equivalent method for JSON.
If you want to filter JSON strings easily, first convert them into JavaScript objects:
var data = JSON.parse(jsonString);
Remember that JSON parsers are strict when it comes to object keys being strings (http://json.org):
[{ "Id": 1, "color": "blue" }, { "Id": 2, "color": "green" }, ...]
Once converted, you can utilize the filter function on the resulting Array:
var result = data.filter(function(item) {
return item.color === "blue";
});
console.log(result[0]); // [Object] :: { Id: 1, color: "blue" }
To ensure compatibility with older browsers, consider adding json2.js for JSON.parse, and incorporate the "Compatibility" code recommended by MDN for filter (or opt for ES5-shim which provides a range of such definitions).
Just a reminder, JSON is not a programming language—it's a data interchange format. If you're referring to JavaScript, then yes, you will need to write the code yourself as there isn't a pre-built feature for that.
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