I was doing JavaScript, and I was wondering : can we declare a type for our variable ? if yes, how?
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Using JSDoc with Google Closure Compiler counts in?Lesha Ogonkov– Lesha Ogonkov2014-10-09 19:59:43 +00:00Commented Oct 9, 2014 at 19:59
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4 Answers
No javascript variables are not typed.
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DoubleDouble
This is best for understanding, but not technically correct. It is possible to change the type... or even use this when you declare the variable... but you really shouldn't need to... w3schools.com/js/js_type_conversion.asp for more information.
Technically you don't need to/can't because JavaScript is a loosely written coding language. Though when you declare a variable it is that datatype, only difference is that we can overwrite these values and the datatype is updated.
var one = 15; //int
var two = "Hello";//string
var three = false; //boolean
var four = ["hello","world"];//object Array
var five = {prop:"key"}; //object Object
Now we can also rewrite these and the datatype will be changed. To check for the data type do
console.log(typeof one);
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see http://www.w3schools.com/js/js_datatypes.asp
types in javascript are automatically and when you assign something to a variable for example
var myVar = "Hello World";
the type of myVar changed automatically to string and you can see it with the typeof function
