How to get variable value after . operator..?

Question

I have Json like

var sampleJson=[{
A101:20000
}];

while get the value from json in java script

var col=A101;
var value=sampleJson[0].col

here col variable have value A101

that i need to replace here in below line

var value=sampleJson[0].col

how to get value after this .operator..?

Answer 1

You should use this:

var col = 'A101';
var value=sampleJson[0][col]

Answer 2

You can use a string with A101 and square brackets.

var col="A101";
var value=sampleJson[0][col];