The article itself seems to contain an error. The author states that the following: typeof result !== 'number' ..returns "Boolean" because it's interpreted a

The article itself seems to contain an error. The author states that the following: typeof result !== 'number' ..returns "Boolean" because it's interpreted as: typeof (result !== 'number') I don't believe this is true. typeof has precedence over in/equality [0], so you don't need parantheses, as recommended in the article, like typeof(result). The original statement works as expected. [0] https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Operator_Precedence https://developer.mozilla.org/en-US/docs/Web/JavaScript/Refe...