declaration.js

// How do you tend to declare variables in your code, when nested in an if / else? 
// All three are functionally equivalent.
// (Ternary is cheating for these purposes.)

// Option 1:

function() {
  if (condition) {
    var attrs = a;
  } else {
    var attrs = b;
  }
}


// Option 2:

function() {
  var attrs;
  if (condition) {
    attrs = a;
  } else {
    attrs = b;
  }
}


// Option 3:

function() {
  if (condition) {
    var attrs = a;
  } else {
    attrs = b;
  }
}

var res = (function () {
  if (condition) {
    return a;
  } else {
    return b;
  })();

(Just kidding, I'm all about #2)

Crockford will destroy you with his mind if you choose 1 or 3.

Every JS dev knows in the heart #1 should be the right answer. #2 is C and #3 is asking for trouble.

#2

el numero dos.

@andrewvc

var res = (function () {
  if (condition) return a
  return b
}())

#2

@fat that's so pretty

 var a = (function(){ return 'value'; }).call(this);

@fat I never, ever, leave braces off when optional in JS. I'll take the line-noise for security. if w/o braces only works when it's at the end of a line a la Ruby.

#2

I never, ever, leave braces off when optional in JS

@andrewvc