//When you commonly declare an array variable in JS
var questionsList=[];

//And now you want to push an element into it using for loop
for(var i=0; i<someVar.length; i++) {
  questionsList.push(someVar[i].question);
}

//If you would like to remove some index, then first take the index
var index = wrapList.indexOf(0);
wrapList.splice(index,1);
//Above the second param basically tells to remove one element from the 0 index, if you give it 2, it will remove two elements, keep it 1

//Now consider you wanted to declare a variable in JS with a key and a value, then you would have declared like this:
var wrapList = [{label="", value=""}, {label="", value=""}];
//However, above just can have two elements when you push some value into it
wrapList[0].label = 'test';
wrapList[0].value = 'testvalue';
wrapList[1].label = 'test1';
wrapList[1].value = 'test1value';
//You can ofcourse try creating a map variable in JS dynamically, i am still to figure out that, but do hit me with comments on it, if you know