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Javascript Meaning Of Double Question Mark

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Javascript meaning of double question mark. Then x will point to the value of foo. The question mark is used in javascript as an alternative to an if statement especially in the case where a value is assigned based on a conditional. The definition of how it works is.

The double exclamation mark in javascript basically means convert to boolean invert then invert again. Think of it. What is double exclamation marks in javascript mean.

Although not the most common use of a logical operator in javascript the double bang or double exclamation mark recently caught my attention. Let s dive into its mechanics. Typeof javascript static javascript is not a static language rather it is a dynamic language.

As you can see the double question mark operator returns the first value that is not null. Then x will point to the value after the double question marks. Next recommended reading replace double quotes to single quotes in c.

July 2 2013 javascript double exclamation mark javascript operators adam i find this to be a terribly obscure way to do a type conversion. Essentially it converts a value null undefined objects etc to a primitive boolean value. What does the double exclamation mark mean.

If the value of foo is null. If you have ever noticed a double exclamation mark in someone s javascript code you may be curious what it s for and what it does. Otherwise it returns its second operand.

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