If applied to boolean values, the&&operator only returnstruewhen both of its operands aretrue(andfalsein all other cases), while the||operator only returnsfalsewhen both of its operands arefalse(andtruein all other cases). Using Logical Operators with Non-Boolean Values# In JavaScript, the l...
Comparison and Logical operators are used to test for true or false.Comparison OperatorsComparison operators are used in logical statements to determine equality or difference between variables or values. Given that x = 5, the table below explains the comparison operators:OperatorDescriptionComparing...
In JavaScript, logical operators are used for boolean logic where a boolean value may be returned depending on the outcome of an expression. With the || (OR) operator, since values don't need to be explicitly true or false (they can be truthy or falsy), the operator can return non-...
Note: In JavaScript, == is a comparison operator, whereas = is an assignment operator. If you mistakenly use = instead of ==, you might get unexpected results.2. Not Equal To OperatorThe not equal to operator != evaluates totrue if the values of the operands aren't equal. false if ...
The logical operators used in Javascript are listed below:OperatorUsageDescription Logical AND ( && ) a && b is true if both a and b are true. Logical OR ( || ) a || b is true if either a or b is true. Logical NOT ( ! ) !a is true if a is not true. JavaScript ...
逻辑布尔运算符使用bool操作数执行逻辑运算。 运算符包括一元逻辑非 (!)、二元逻辑 AND (&)、OR (|) 以及异或 (^),二元条件逻辑 AND (&&) 和 OR (||)。 一元!(逻辑非)运算符。 二元&(逻辑与)、|(逻辑或)和^(逻辑异或)运算符。 这些运算符始终计算两个操作数。
Operator keyword for&& C++ specifiesandas an alternative spelling for&&. In C, the alternative spelling is provided as a macro in the <iso646.h> header. In C++, the alternative spelling is a keyword; use of <iso646.h> or the C++ equivalent <ciso646> is deprecated. In Microsoft C++, ...
The second operand is evaluated only if the first operand evaluates to true (nonzero). This evaluation eliminates needless evaluation of the second operand when the logical AND expression is false. You can use this short-circuit evaluation to prevent null-pointer dereferencing, as shown in the fo...
There are three types of relational operators: equality, comparison, and logical. Equality As we’ve already encountered a few times in this chapter, the equality operator is == (two equals signs). It is important not to confuse it with the = (single equals sign) assignment operator. In ...
Logical AND Operator (&&) Article 10/04/2012 In this article Arguments Remarks Requirements See Also Performs a logical conjunction on two expressions. Copy expression1 && expression2 Arguments expression1 Any expression. expression2 Any expression. ...