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.

Alnitak · Accepted Answer · 2015-03-16 16:22:36Z

8

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.

answered Mar 16, 2015 at 16:22

Alnitak

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2 Comments

Coltrane Nadler Over a year ago

thanks! I feel silly that I overlooked that now haha.

Andrea Mattioli Over a year ago

@ColtraneNadler you can formally accept Alnitak's answer, if it's the right answer.

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