Fetch value by dynamic key from javascript object

Question

I just want to fetch object values by dynamic key, I need this because of web service providing data in this form

var apiData = [{first_name:"ashwani"},{second_name:"raju"},{third_name:"ravi"}]
var naming=["first","second","third"]
for(i=0;i<apiData.length;i++){
    var symKey=naming[i] + "_name";  
    console.log(apiData[i].symKey)
}

But I am getting undefined, how can I do that ?

score 2 · Accepted Answer · answered Jan 29 '20 at 05:39

2

Use brackets [] instead of . notation.

.symkey will look for a property called symkey in the object.

var apiData = [{first_name:"ashwani"},{second_name:"raju"},{third_name:"ravi"}]
var naming=["first","second","third"]
for(i=0;i<apiData.length;i++){
    var symKey=naming[i] + "_name";  
    console.log(apiData[i][symKey])
}

answered Jan 29 '20 at 05:39

ellipsis

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How `[ ]` work in object ? I could not understand this ? any reference please ? – Ashwani Panwar Jan 29 '20 at 05:41
1

https://www.w3schools.com/js/js_json_objects.asp – ellipsis Jan 29 '20 at 05:43

Fetch value by dynamic key from javascript object

1 Answers1