The Case of the Misidentified null
📰 Dev.to · Code Crumb
Learn why typeof null returns 'object' in JavaScript and how to correctly identify null values
Action Steps
- Check the type of null using the typeof operator
- Use the === operator to compare a value to null
- Apply the Object.prototype.toString.call() method to get the correct type of a value
- Test the difference between typeof and Object.prototype.toString.call() with null and other values
- Compare the results of typeof and Object.prototype.toString.call() to understand the nuances of JavaScript type checking
Who Needs to Know This
All developers, especially those working with JavaScript, will benefit from understanding this concept to write more accurate and efficient code
Key Insight
💡 The typeof operator in JavaScript returns 'object' for null because of a historical reason, but you can use other methods like === or Object.prototype.toString.call() to correctly identify null values
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Did you know typeof null returns 'object' in JavaScript? Learn why and how to correctly identify null values
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