javascript Programming Glossary: falsy

http://stackoverflow.com/questions/1688337/javascript-if-alternative

assigned to the score variable only if that value is not falsy falsy values are false null undefined 0 zero length string or.. to the score variable only if that value is not falsy falsy values are false null undefined 0 zero length string or NaN.. undefined 0 zero length string or NaN . Otherwise if it's falsy '0' will be assigned. Update The performance will be equivalent..

What is the best way to do loops in JavaScript

http://stackoverflow.com/questions/193547/what-is-the-best-way-to-do-loops-in-javascript

is only acceptable for iterating a list that contains non falsy values. If this array contained any of 0 false null NaN the..

Remove empty elements from an array in Javascript

http://stackoverflow.com/questions/281264/remove-empty-elements-from-an-array-in-javascript

elements into other array the example removes every falsy value undefined null 0 false NaN and '' function cleanArray..

What does “options = options || {}” mean in Javascript?

http://stackoverflow.com/questions/2851404/what-does-options-options-mean-in-javascript

will return its second operand if the first one is falsy . Falsy values are 0 null undefined an empty string NaN and..

In Javascript, what does it mean when there is a logical operator in a variable declaration?

http://stackoverflow.com/questions/3088098/in-javascript-what-does-it-mean-when-there-is-a-logical-operator-in-a-variable

value in this case the value of y if the x variable is falsy . The boolean operators in JavaScript can return an operand.. the value of its second operand if the first one is falsy otherwise the value of the first operand is returned. For example..

How to check for “undefined” in JavaScript?

http://stackoverflow.com/questions/3390396/how-to-check-for-undefined-in-javascript

is non writable. if window.myVar will also include these falsy values so it's not very robust false 0 NaN null undefined Thanks..

Empty for loop - for(;;)

http://stackoverflow.com/questions/4740979/empty-for-loop-for

immediately The second part of it is empty and therefore falsy. Isn't it true that when the second part is falsy the for loop.. falsy. Isn't it true that when the second part is falsy the for loop stops and execution continues with code which comes..

JavaScript equality transitivity is weird

http://stackoverflow.com/questions/5447153/javascript-equality-transitivity-is-weird

Niall . 0 '' true Hence why this one is true because 0 is falsy and the empty string is falsy . 0 '0' true This one is a bit.. one is true because 0 is falsy and the empty string is falsy . 0 '0' true This one is a bit trickier. If you do '0' you get.. is not equal to anything else except null . However it is falsy . false null false Again null is special. It is only equal to..

javascript empty array seems to be true and false at the same time

http://stackoverflow.com/questions/5491605/javascript-empty-array-seems-to-be-true-and-false-at-the-same-time

Is there a standard function to check for null, undefined, or blank variables in JavaScript?

http://stackoverflow.com/questions/5515310/is-there-a-standard-function-to-check-for-null-undefined-or-blank-variables-in

string 0 false The above list represents all possible falsy values in ECMA Javascript. Find it in the specification at the..

Comparing two arrays in Javascript

http://stackoverflow.com/questions/7837456/comparing-two-arrays-in-javascript

function array if the other array is a falsy value return if array return false compare lengths can save..

(1,eval)('this') vs eval('this') in JavaScript?

http://stackoverflow.com/questions/9107240/1-evalthis-vs-evalthis-in-javascript

be set to null or undefined . It can be set to other falsy values 0 '' NaN false but only very deliberately. I'm going..

Logical operator || in javascript, 0 stands for Boolean false?

http://stackoverflow.com/questions/9579262/logical-operator-in-javascript-0-stands-for-boolean-false

false. All values in Javascript are either truthy or falsy . The following values are equivalent to false in conditional..