Now I am sending length as a string as a function parameter.
function sample(operation){
var str="hello";
console.log(str.operation);
}
sample("length");
I am not allowed to change the way I am sending length(has to be a string).What can I do for this function to give me the expected output?
If you just want to access the property, use bracket notation for your property accessor:
console.log(str[operation])