[SOLVED] typecast float to int in javascript?

A forum search has lead me to think it's not doable.

"as" only works on reference types and Unity doesn't dig

Code (csharp):

1.     var f1 : float = 3.14;
2.     var myVar : int = (int)f1;

or

Code (csharp):

1.     var f1 : float = 3.14;
2.     var myVar : int = int(f1);

If anyone knows a typecast method that work's I'd appreciate a "how to".

 

Hello

On JS use parseInt(yourFloatHere)

so it will be something like this:

Code (csharp):

1.  
2. var f1 : float = 3.15;
3. var i1 : int = parseInt(f1);
4.  

if it doesnt work, try with ParseInt() cant remember well if its lower or upper case

hope it helps !!!

 

You dah man! Thanx.

I'm used to parseInt() taking a String argument, not any other data type. So I did try the rather circuitous:

Code (csharp):

1.     var f1 : float = 3.14;
2.     var fs : String = f1.ToString();
3.     var i1 : int = parseInt(fs);

Thing is, ToString() doesn't seem to work on floats, trying to access the fs var from the code above throws a NullReferenceException. ToString() does work on the int type. The following works fine:

Code (csharp):

1.     var i1 : int = 3;
2.     var is : String = i1.ToString();
3.     var i2 : int = parseInt(is);

Of course that's redundant; why go through the trouble if i1 and i2 are the same. :roll: But it illustrates the point.

Note that parseInt() truncates a float so in:

Code (csharp):

1.     var f1 : float = 3.14;
2.     var f2 : float = 3.99;
3.     var i1 : int = parseInt(f1);
4.     var i2 : int = parseInt(f2);

i1 and i2 both = 3. In the project I'm working on that doesn't matter, but if rounding is required:

Code (csharp):

1.     var f1 : float = 3.14;
2.     var f2 : float = 3.99;
3.     var i1 : int = parseInt(Mathf.Round(f1));
4.     var i2 : int = parseInt(Mathf.Round(f2));

results in i1 = 3 and i2 = 4.

Thanx again for the info, you saved the day!

 

In Javascript all numbers are stored as floats. Internally there's no such thing as an "int" as usually understood. (Also, Javascript is a "loosely typed" language, so it doesn't have a concept of "typecasting" in any case.) In Javascript, what seems to the user to be an integer is really just a floating point number with nothing meaningful after the decimal point.

The easiest way to produce something that acts pretty much like an int [while avoiding the transition to a string and back again of parseInt()] is to use the "round" function, something like this:

Depending on what you're doing, Math.floor(...) or Math.ceil(...) may be more appropriate than Math.round(...).

 

Wrong-o. You're on a Unity forum, and Unity doesn't use web Javascript. None of what you wrote is true when it comes to Unity. Namely: int certainly exists, it's not loosely typed, there is typecasting, and there is no Math.round (Mathf.Round, rather). This is why "Javascript" is frequently referred to as Unityscript, since it's a custom language and has many significant differences compared to Javascript. You'd be better off thinking of it as being like ActionScript3, though there are still a number of differences compared to that.

--Eric