The difference between = and = is usually characterized that = checks for value equality and = checks for both values and type equality. The specific list of "falsy" values in JavaScript is as follows:Īny value that's not on this "falsy" list is "truthy." Here are some examples of those: Typeof array // "object" arrays are special objects That is, typeof "abc" returns "string", not string. The return value from the typeof operator is always one of six (seven as of ES6! - the "symbol" type) string values. They can optionally explain how if that's particularly confusing. The JavaScript engine actually compiles the program on the fly and then immediately runs the compiled code.Ĭomments should explain why not what. It's typically asserted that JavaScript is interpreted because your JavaScript source code is processed each time it's run. You don't really know JavaScript, yet, but if you dig into this series, you will. That JavaScript is but a shadow of the true language. The JavaScript you know right now is probably parts handed down to you by others who've been burned by incomplete understanding. These are a few of the important takeaways from Kyle Simpson's YDKJS - UP & GOING book series.
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