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  • What is the difference in JavaScript between undefined and not . . .
    Yes, variables can have a value of undefined and you can explicitly assign values to them Assigning undefined to a variable though is probably confusing, since it's a bit of a paradox (you've defined the variable as undefined) and it's not possible to distinguish that variable from either variables that don't exist or uninitialised variables
  • What is the difference between null and undefined in JavaScript?
    undefined cannot be an empty wall if the holder represents the variable In this representation, undefined is an empty holder while null is an empty holder with post-it note empty (so the unfortunate user knows it's useless to ask the cleaning lady for toilet paper)
  • How can I check for undefined in JavaScript? - Stack Overflow
    – Daniel Schaffer Aug 2, 2010 at 18:09 3 See: How to check for undefined in javascript?, and whether a variable is undefined and How to handle ‘undefined’ in javascript – Shog9 Aug 3, 2010 at 8:47 3
  • How to check for an undefined or null variable in JavaScript?
    While literally using the keyword undefined, Boolean(undefined) works, trying that with an undefined variable doesn't work, and that is the whole point of doing the check for null or undefined
  • JavaScript checking for null vs. undefined and difference between . . .
    Example: x === null check whether it's undefined by either of two basic methods: direct comparison with undefined or typeof For various reasons, I prefer typeof x === "undefined" check whether it's one of null and undefined by using == and relying on the slightly arcane type coercion rules that mean x == null does exactly what you want
  • JavaScript: undefined !== undefined? - Stack Overflow
    The biggest misconception in many of the answers here is that 'undefined' is a Javascript keyword It's not a keyword at all, but a variable that (most of the time) happens to be undefined So the only time "somevar === undefined" works is when the 'undefined' variable really hasn't been defined
  • How to handle undefined in JavaScript - Stack Overflow
    typeof foo !== 'undefined' window foo !== undefined 'foo' in window The first two should be equivalent (as long as foo isn't shadowed by a local variable), whereas the last one will return true if the global varible is defined, but not initialized (or explicitly set to undefined)
  • Javascript undefined condition - Stack Overflow
    undefined is a variable, not a constant, and can be assigned a value Because of this, one school of thought says the second path is safer, since you cannot be sure of the value of undefined There is another school of thought that says those who redefine undefined deserve exactly what they get
  • javascript - variable === undefined vs. typeof . . . - Stack Overflow
    390 The jQuery Core Style Guidelines suggest two different ways to check whether a variable is defined Global Variables: typeof variable === "undefined" Local Variables: variable === undefined Properties: object prop === undefined Why does jQuery use one approach for global variables and another for locals and properties?
  • The difference between `typeof x !== undefined` and `x != null`
    I can't find any difference between typeof somevar == 'undefined' and typeof somevar === 'undefined', because typeof always returns string For null it will return 'object' Or could be that I am wrong?





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