Isnan Function

src/data/question-groups/javascript/content/isnan-function.md

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You use the isNaN function to check when a value is "Not a Number." It attempts to convert the given value to a number and then checks if the result is a NaN. If the value is not a number, it'll return true, but if it is a number, it'll return false.

javascript

console.log(isNaN("study")); // true

console.log(isNaN(4)); // false