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...
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 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...
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...
I know that you can test for width() or height() but what if the element's display property is set to none? What other value is there to check to make sure the element exists?...
Can I somehow use if-then-else construction (ternary-operator) in angularjs expression, for example I have function $scope.isExists(item) that has to return bool value. I want something like this,  <div ng-repeater="item in items">...
I'm searching for a short way to write this:      if ( variable == 1 || variable == 2 || variable == 6)   I tried      if (variable == 1 || 2 || 6)   but it doesn't seem to work. Is there an easy way to do this?...
I'm new to programming in JavaScript, and I need help! I am making a small program that randomly selects a number (1-4) and then prints out a statement based on the number. A=1, 2=B, 3=C, and 4=D. My problem is that with my if/else statements, I...

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