Changing Data Types in Javascript

Question

Im brand new to javascript, and relatively new to programming as a whole. I've been understanding the mechanics of javascript, but im stumped however in a situation like the following:

var dataTypes = {
 string1: "Test",
 string2: "Test",
 number1: 4,
};
console.log(typeof dataTypes.number1);
console.log(" ");
for (var x in dataTypes) {
 console.log(typeof x);
 if ((typeof x) === "string") {
 console.log(dataTypes[x]);
 } else {
 //
 }
}

And when I run this, my console displays the following:

number 
string
Test
string
Test
string
4

I'm so confused how dataTypes.number1 went from being a number data type to a string. If anyone could take the time to elaborate what i have done wrong, and explain, that would be wonderful.

Answer 1

Your variable x is the key (rather than the value) associated with each key/value pair in dataTypes. Is is therefore always a string.

You need to examine typeof dataTypes[x] instead.

• Coltrane Nadler: thanks! I feel silly that I overlooked that now haha.
• Andrea Mattioli: @ColtraneNadler you can formally accept Alnitak's answer, if it's the right answer.