Get the value of javascript object based on key?

Question

How we can get the specific key value which is dynamically created, like

car object is dynamic like

 var car = {type:"Fiat", model_2017:"500", color:"white"};
 var car = {type:"Fiat", model_2016:"500", color:"white"};
 var car = {type:"Fiat", model_2015:"500", color:"white"};

How to get the value of second field, which is dynamic, i'm trying like this but it is giving undefined

var model_year=2015;
model_year= "model_"+model_year
car.model_year

what is the expected output? & you have same variable with different content — brk, Jul 10 '17 at 05:29

score 2 · Accepted Answer · edited Jul 10 '17 at 05:35

2

You can try accessing with [] syntax

car[model_year]

var car = {type:"Fiat", model_2017:"500", color:"white"};
var car = {type:"Fiat", model_2016:"500", color:"white"};
var car = {type:"Fiat", model_2015:"500", color:"white"};

var model_year=2015;
model_year= "model_"+model_year
console.log(car[model_year])

edited Jul 10 '17 at 05:35

Hassan Imam

20,493
5
36
47

answered Jul 10 '17 at 05:29

Suresh Atta

118,038
37
189
297

why you write the unnecessary first two code-lines? – Frank Wisniewski Jul 10 '17 at 05:38
They make clear that a model _key_ can be accessed programmatically since the "model_" prefix is a string constant and the year is joined from a _variable_. – try-catch-finally Jul 10 '17 at 05:39

Get the value of javascript object based on key?

1 Answers1