What is the difference between Null vs Empty (Zero Length) string?

If the ‘slideshow’ key is normally supposed to contain a string value, but you want to give it an empty value, then give it the empty string. The empty string is still a string data type, so it is more likely to react the way you expect in a string function. The null value is not a string, and if you don’t have more information on how it is used, may or may not behave the way you want it to.

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