If you're in the global scope then there's not much difference. Read Kangax's answer for explanation. If you're in a function then var will create a local variable, "no var" will look up the …

Mar 6, 2014 · Ex- var msg; //multi line declaration var focusname; var msg, focusname; //Single line declaration Here, msg & focusname are variable names that holds value. var keyword is …

That line of code does the following: IF variable is not defined (or has a falsey value) THEN set it to an empty object. ELSE do nothing (technically speaking, variable gets assigned to itself)

Apr 18, 2009 · The use of "let" just defers this problem. So each iteration creates a private independent block scope, but the "i" variable can still be corrupted by subsequent changes …

Feb 3, 2011 · Sometimes this can refer to another scope and refer to something else, for example suppose you want to call a constructor method inside a DOM event, in this case this will refer …

Feb 22, 2015 · People closing this is "lack of basic understanding" - how do you figure that? What previous knowledge of JavaScript do you expect Winters to have when approaching this …

Feb 17, 2010 · It means an array. var openTollDebug = []; declares the openTollDebug variable and initializes it to an empty array.

In languages with block scope, it is usually recommended that variables be declared at the site of first use. But because JavaScript does not have block scope, it is wiser to declare all of a …

Mar 7, 2016 · I haven't seen anything here or on MDN. I'm sure I'm just missing something. There's got to be some documentation on this somewhere. Functionally, it looks like it allows …

Jul 18, 2012 · return !1 in javascript. In a JavaScript file I had to read today, there was a line where a variable was declared like a factorial, like this : var myVariable = !1; and then …