Dynamic insertion in object javascript [duplicate]

Question

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Dynamically Add to Javascript Object (4 answers)

Closed 9 years ago.

I have defined data like an array of objects:

{"Driver":a, "Lap":b, "Position":c}

I want with a loop to insert in the same row all the drivers for each lap (into another data). For example:

 {"Lap":1,"Driver1":2,"Driver2":1,"Driver3":3}
 {"Lap":2,"Driver1":1,"Driver2":2,"Driver3":3}
 {"Lap":3,"Driver1":3,"Driver2":2,"Driver3":1} 
 {"Lap":4,"Driver1":2,"Driver2":1,"Driver3":3}

I know the number of the Laps (in variable maxLaps) and the number of the drivers on variable numDrivers.

I want to make that in a loop because the number of the laps and drivers change in different cases, so I need to do my code generic

• I wrestled a bear once.: make sure all of your datas are good and do your code really generic
• Barmar: Why don't you use an array instead of separate DriverX properties?

Answer 1

Define a Javascript object like:

var myObject = { "Driver": a, "Lap": b, "Position": c };

Add new properties to this object as:

myObject.newProperty = d; // now you have: { "Driver": a, "Lap": b, "Position": c, "newProperty": d }

Add a dynamic property as:

myObject[dynamicProperty] = e; // now if your dynamic property is 'test', your object is: { "Driver": a, "Lap": b, "Position": c, "newProperty": d, "test": e }

• I wrestled a bear once.: why lose the double quotes..., technically json is supposed to have them, js just doesnt require them
• Rahul Desai: @PootieTang Gotcha. I've updated my answer.
• Paul S.: @PootieTang JSON isn't JavaScript, it's just a notation. In JavaScript, JSON would be a string
• Matt Burland: @PootieTang There are actually some case where they are required. For example, you could do var a = { "a-b" : 1 } but without the quotes it would be a syntax error.
• I wrestled a bear once.: yes, it's a notation... a javascript notation... that's three of the 4 letters in json... let's not get nit-picky here i'm not a noob