Which method of checking if a variable has been initialized is better/correct? (Assuming the variable could hold anything (string, int, object, function, etc.))  if (elem) { // or !elem   or  if (typeof(elem) !== 'undefined') {   or  if (el...
Are the two identical?  Suppose you have:  var x = true;   And then you have one of either:  x && doSomething();   or  if(x) doSomething();   Is there any differene whatsoever between the two syntaxes?  Did I stumble across a nice bit of su...
How can I use an inline if statement in JavaScript? Is there an inline else statement too?  Something like this:  var a = 2; var b = 3;  if(a < b) {     // do something }...
I am making a simple trigonometry program in javascript and my if and while statements are not working properly, as they only pass if the first condition is true i.e. if you type in Sine it will work, but not if you type in Cosine or Tangent.  <...
I want to check if a value is in an accepted range. If yes, to do something; otherwise, something else.  The range is 0.001-0.009. I know how to use multiple if to check this, but I want to know if there is any way to check it in a single if statem...
So, I'm looking into writing a slightly more complex operation with logic operators in an if-else statement. I know I can do parentheses, and I know it's the better way of doing this, but I've gotten curious and so I'm going to ask....
I have a very long conditional statement like the following:  if(test.type == 'itema' || test.type == 'itemb' || test.type == 'itemc' || test.type == 'itemd'){     // do something. }   I was wondering if I could refa...
Are variables declared and assigned in an "if" statement visible only within that "if" block or within the whole function?   Am I doing this right in the following code? (seems to work, but declaring "var structure" multiple t...
So I'm using a shorthand javascript if/else statement (I read somewhere they're called Ternary statements?)  this.dragHandle.hasClass('handle-low') ? direction = "left" : direction = "right"  This works great, but what...

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