Webtypeof 999-3223; // returns, NaN. This is because, first typeof 999 will result in a string, "number". The expression "number" - 32223 results in NaN as happens when you perform a subtraction operation between a string and number. JavaScript typeof Examples. The following code snippet shows the type check result of various values using the ... WebI just made some tests in node.js v4.2.4 (but this is true in any javascript implementation): > typeof NaN 'number' > isNaN(NaN) true > isNaN("hello") true . the surprise is the first one as type of NaN is "number", but that is how it is defined in javascript. So the next test brings up unexpected result > typeof Number("hello") "number"
how to check for datatype in node js- specifically for integer
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