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JavaScriptBeginner#coercion

What are truthy and falsy values?

Falsy values are false, 0, -0, 0n, '', null, undefined and NaN. Everything else is truthy, including '0', 'false', [] and {}.

Example
if ([]) console.log('empty array is truthy'); // prints
Boolean('0');   // true
Boolean(NaN);   // false

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