Lieutenant Shatkin
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Apr 24, 2009 · If you wanted to Booleanize 5/0 using a double-bang, you'd need to use !!(5/0). –
Dec 31, 2020 · 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.
Jun 19, 2024 · 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.
Jul 2, 2020 · 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.
Sep 8, 2017 · 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,...
Mar 28, 2015 · It's a way of casting a "truthy" or "falsy" value to true or false, respectively. Given a boolean, ! will negate the value, i.e. !true yields false and vice versa. Given something other than a boolean, the value will first be converted to a boolean and then negated.
