How to do return a dynamic object key in array.map()

Question

How to do return a dynamic object key in array.map()

I'm just getting max value from a array by a object with using this below code which is works good.

Math.max.apply(Math, class.map(function (o) { return o.Students; }));

where, class is an array and Students is an key of that array object

But Whenever I need to get a maximum value, I need write that full code. So I planed to move that code to a common method as below.

 getMaxValue(array: any[], obj: key) {
      return  Math.max.apply(Math, array.map(function (o) { 
               return o.key;  // Here I want return students objects
               }));   
           }

where, I have passing a array and key(which is want to get the max value, like students). So whenever I want to get the max value I just call the method just like

 var maxOfStudents = getMaxValue(class, "Students");

But I don't know how to return the key dynamically from a object in array.map(). how to do it?

String `key` instead of object and `o[key]` should do the trick. — Stanislav Kvitash, Jun 23 '17 at 10:26
@StanislavKvitash . yupe. I have asked that for a new question : https://stackoverflow.com/questions/44719783/how-to-get-maximum-of-value-between-multiple-objects-from-array — Ramesh Rajendran, Jun 23 '17 at 11:00

score 4 · Accepted Answer · answered Jun 23 '17 at 10:26

4

Use bracket notation to access the property using a string from an object.

return o[key];

answered Jun 23 '17 at 10:26

Pranav C Balan

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How to do return a dynamic object key in array.map()

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