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If you wanted to Booleanize 5/0 using a double-bang, you'd need to use !!(5/0). –
We can use this to cast a variable to true or false using the double bang operator. Let’s dive deep into what it is and how it works. The ! in JavaScript, also called “bang”, is the logical “not” operator.
I always thought the double bang was the way to go in terms of performance. Although with a double bang you have to make two conversions (falsy/truthy -> boolean -> boolean). But maybe browsers have some optimizations built-in, for either way.
You should use the double-bang operator in JavaScript when you either need a strict Boolean value; or, when you're passing a value out-of-scope and you don't know if the value will be consumed as a strict Boolean. On the latter point, the "don't know" portion is critical.
Double Bang is an American dramatic film starring William Baldwin, Jon Seda, and Adam Baldwin, The film was written and directed by Heywood Gould.
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,...
Aug 10, 2023 · The double bang (!!) operator in JavaScript is a quick method to turn a truthy or falsy value into a boolean. It is also called as “not not” or “bang bang” operator, as it consists of two exclamation marks (!!) placed consecutively.
