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javascript Programming Glossary: truthyWhat does `!!~` mean in javascript? [duplicate] http://stackoverflow.com/questions/10582286/what-does-mean-in-javascript at least one bit set to zero inverting it will create a truthy value applying operator twice to a truthy value yields boolean.. it will create a truthy value applying operator twice to a truthy value yields boolean true. The above mentioned function returns..
What does a tilde do when it precedes an expression? http://stackoverflow.com/questions/12299665/what-does-a-tilde-do-when-it-precedes-an-expression a nasty trick to turn indexOf 's found return value into truthy while making not found as falsy and people often use it for..
http://stackoverflow.com/questions/12973706/javascript-collection possible way of defaulting. Why does it work Because of truthy and falsy values. When evaluated in a logical condition undefined..
Javascript : assign variable in if condition statement, good practice or not? http://stackoverflow.com/questions/2576571/javascript-assign-variable-in-if-condition-statement-good-practice-or-not
(![]+[])[+[]]… Explain why this works http://stackoverflow.com/questions/4170978/explain-why-this-works because an array object as any other Object instance is truthy and applying the Logical NOT unary operator it produces the.. it produces the value false for example. false it was truthy false it was truthy 0 true it was falsey NaN true it was falsey.. value false for example. false it was truthy false it was truthy 0 true it was falsey NaN true it was falsey After it we have..
Conflicting boolean values of an empty JavaScript array http://stackoverflow.com/questions/4226101/conflicting-boolean-values-of-an-empty-javascript-array negation produces true because all object instances are truthy false is truthy true negation The only values that are falsey.. true because all object instances are truthy false is truthy true negation The only values that are falsey are null undefined..
JavaScript equality transitivity is weird http://stackoverflow.com/questions/5447153/javascript-equality-transitivity-is-weird If you do '0' you get true so the string is definitely truthy . However using doesn't check types only values and 0 can be..
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 this question You can just check if the variable has a truthy value or not. That means if value will evaluate to true if value.. is declared at least you should directly check if it has a truthy value like shown above. Further read http typeofnan.blogspot.com..
http://stackoverflow.com/questions/6970346/what-is-x-foo unless that first expression evaluates to something truthy. If it is truthy it then will be executed in order to try the.. first expression evaluates to something truthy. If it is truthy it then will be executed in order to try the second test. Conversely..
Why does !new Boolean(false) equals false in JavaScript? http://stackoverflow.com/questions/8695341/why-does-new-booleanfalse-equals-false-in-javascript an object which is not null. Non null objects are always truthy. As a result of any non null object will always be false. To..
Does PHP support conjunction and disjunction natively? http://stackoverflow.com/questions/9065182/does-php-support-conjunction-and-disjunction-natively b would return a boolean value TRUE or FALSE if either is truthy or both are falsy. It would NOT return the value of b if a was.. values and return the result. It will not return the first truthy value of the two. More idiomatically in PHP if there is such..
Logical operator || in javascript, 0 stands for Boolean false? http://stackoverflow.com/questions/9579262/logical-operator-in-javascript-0-stands-for-boolean-false returns false. All values in Javascript are either truthy or falsy . The following values are equivalent to false in conditional..
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