In boolean short-circuiting logic, for examplefirstBoolean && secondBoolean, if firstBoolean is false then the remaining part of the expression is ignored (the operation is short-circuited) because the remaining evaluation will be redundant. Similarly infirstBoolean || secondBoolean, if firstBoolean...
这个概念是对于逻辑运算符&&和||而言的,是一种逻辑运算符的求值策略。只有当第一个运算数的值无法确定逻辑运算的结果时,才对第二个运算数进行求值。例如,当&&的第一个运算数的值为false时,其结果必定为false;当||的第一个运算数为true时,最后结果必定为true,在这种情况下,就不需要知道第二个运算数的具体值...
“短路求值(Short-Circuit Evaluation) // 逻辑与和逻辑或操作符总是先计算其做操作数,只有在仅靠左操作数的值无法确定该逻辑表达式的结果时,才会求解其右操作数。 functionaa() {if(null) { console.log('null') }if(undefined) { console.log('undefined') }if(false) { console.log('false') }if(tr...
In some programming languages (Lisp), the usual Boolean operators are short-circuit. In others (Java, Ada), both short-circuit and standard Boolean operators are available. 展开 关键词: Evaluation Strategy Eager Evaluation Lisp (Programming Language Conditional Expression ...
Short-circuit evaluation of and and or takes place for if, elsif, until, and while conditions only. It is not used in other contexts. For example −x = 1 or {1,2,3,4,5} -- x should be set to {1,1,1,1,1} If short-circuiting were used here, you would set x to 1, ...
Short-circuit evaluation denotes the semantics of propositional connectives in which the second argument is evaluated only if the first is insufficient to determine the value of the expression. Compound statements are evaluated from left to right. Short-circuit evaluation is widely used in programming,...
Short-circuit evaluation PREMIUM Series: Conditionals Trey Hunner 4 min. read • Watch as video • Python 3.9—3.13 • April 25, 2023 Let's talk about short-circuiting in Python with Python's boolean operators.Using nested if statements to chain conditions...
does not perform short-circuit evaluation "Does not perform short-circuit evaluation" 通常指的是某个表达式或语句不会利用短路求值(short-circuit evaluation)的特性。在编程中,短路求值是一种优化技术,它允许程序员在逻辑表达式中提前终止某些条件的计算。这通常是通过使用逻辑运算符(如&&或||)来完成的。 例如,...
这种方式被称为“不执行短路求值”(does not perform short-circuit evaluation)。 在一些编程语言中,当使用逻辑运算符“&&”进行逻辑与操作时,如果第一个表达式的结果为假,那么第二个表达式将不会被执行。这种情况下就是短路求值的应用。但在不执行短路求值的情况下,无论第一个表达式的结果是什么,第二个表达式...
The && and || operators are called short-circuit operators. They will return the value of the second operand based on the value of the first operand. The && operator is useful for checking for null objects before accessing their attributes. For example... ...