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IN()Whether a value is within a set of values ISTest a value against a boolean IS NOTTest a value against a boolean IS NOT NULLNOT NULL value test IS NULLNULL value test LIKESimple pattern matching MEMBER OF()Returns true (1) if first operand matches any element of JSON array passed ...
测试数组是否存在 in 测试对象是否存在 of 求幂 a**b 整数除法 a//b示例下面的例子展示了如何在 CoffeeScript 中使用别名 −a=21; b=21 x = true; y = false console.log a is b console.log a isnt b console.log x and y console.log x or y console.log yes or no console.log on or of...
<=> Spaceship $x <=> $y Returns an integer less than, equal to, or greater than zero, depending on if $x is less than, equal to, or greater than $y. Introduced in PHP 7. Try it »PHP Increment / Decrement OperatorsThe PHP increment operators are used to increment a variable's...
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The in OperatorThe in operator returns true if a property is in an object, otherwise false:Object Example const person = {firstName:"John", lastName:"Doe", age:50}; ("firstName" in person); ("age" in person); Try it Yourself » ...
||Logical orReturns true if one of the statements is truex < 5 || x < 4Try it » !Logical notReverse the result, returns false if the result is true!(x < 5 && x < 10)Try it » You will learn much more abouttrueandfalsevalues in a later chapter....
Comparison operators are fully described in theJS Comparisonschapter. JavaScript String Comparison All the comparison operators above can also be used on strings: Example lettext1 ="A"; lettext2 ="B"; letresult = text1 < text2; Try it Yourself » ...
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