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JavaScript

Posted by Greg Schudel
Greg Schudel
4,090 Points

getting error when trying to call new instance...why?

this is part of a code:

function dice(sides){

  this.sides = sides;

  this.roll = function() {
    return Math.floor(Math.random() * this.sides) + 1; 

  }

}

// this is where the instance is called
var dice6 = new Dice(6);

dice6.roll();

the above instance is called for new Dice because you are suppose to call instances with the uppercase letter at the beginner (per proper syntax), HOWEVER, when I do I get the following error in the console:

dice.js:35 Uncaught ReferenceError: Dice is not defined

but when I change the Dice to lowercase dice the error vanishes. WHY? I thought this was the correct syntax for calling a new instance?

romaug
romaug
16,527 Points

First line, function name, d vs D, maybe?

2 Answers

Steven Parker
Steven Parker
243,656 Points
Steven Parker
Steven Parker
243,656 Points

The convention is to define constructors with a capital letter. But whether you follow that convention or not, you must always call it using the same spelling that it was defined with or you will see that error.

Greg Schudel
Greg Schudel
4,090 Points
Greg Schudel
Greg Schudel
4,090 Points

Oh jeeze, that was frustrating the crap out of me. Thank you!