jQuery: If key exists in array, get value

Question

I am trying to see if a certain key exists in an array, and if so, return it's value:

if(jQuery.inArray(live_ids.grade, item.SizePrice) !== -1) {

    console.log(item.SizePrice);

}

This will return:

{"8":"15.00","7":"20.00","1":"6.00","6":"11.00","2":"7.00","3":"8.00","4":"9.00","5":"10.00","11":"20.00","9":"10.00","10":"15.00","13":""}

Now, live_ids.grade = 9, so I want to be able to return 10.00... how do I do that?

Answer 1

Here you check if the number is in the obj than execute else show error.

var obj = {
    "8":"15.00",
    "7":"20.00",
    "1":"6.00",
    "6":"11.00",
    "2":"7.00",
    "3":"8.00",
    "4":"9.00",
    "5":"10.00",
    "11":"20.00",
    "9":"10.00",
    "10":"15.00",
    "13":""
};

var number = 9;

if(number in obj){
    alert(obj[number])
} else {
    alert("This number does not exists")
}