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In JavaScript, the empty string (""), null, undefined, NaN, +0, −0 and false [3] are sometimes called falsy (of which the complement is truthy) to distinguish between strictly type-checked and coerced Booleans (see also: JavaScript syntax#Type conversion). [4] As opposed to Python, empty containers (Arrays, Maps, Sets) are considered truthy.
In JavaScript, the empty string (""), null, undefined, NaN, +0, −0 and false [28] are sometimes called falsy (of which the complement is truthy) to distinguish between strictly type-checked and coerced Booleans (see also: JavaScript syntax#Type conversion). [29] As opposed to Python, empty containers (Arrays, Maps, Sets) are considered truthy.
Douglas Crockford advocates the terms "truthy" and "falsy" to describe how values of various types behave when evaluated in a logical context, especially in regard to edge cases. [11] The binary logical operators returned a Boolean value in early versions of JavaScript, but now they return one of the operands instead.
20 comments Toggle "Truthy" and "falsy" in programming: pre-Colbert or post-Colbert? subsection
In certain computer programming languages, the Elvis operator, often written ?:, is a binary operator that evaluates its first operand and returns it if its value is logically true (according to a language-dependent convention, in other words, a truthy value), and otherwise evaluates and returns its second operand.
In most logical systems, negation, material conditional and false are related as: ¬ p ⇔ (p → ⊥). In fact, this is the definition of negation in some systems, [8] such as intuitionistic logic, and can be proven in propositional calculi where negation is a fundamental connective.
Truthy is the root of "truthiness", the quality of preferring concepts or facts one wishes to be true, rather than actual truth It may also refer to: Truthy (computing) , the truth value of an expression when evaluated as a Boolean data type
In logic and mathematics, second-order logic is an extension of first-order logic, which itself is an extension of propositional logic. [a] Second-order logic is in turn extended by higher-order logic and type theory.