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JSTL fn:length() FunctionThe fn:length() function returns the number of characters inside a string, or the number of items in a collection. It is used for calculating the length of string and to find out the number of elements in a collection. The syntax used for including the fn:length() function is: It returns the length of object. The return type of this function is int . Let's see the simple example to understand the functionality of fn:length() function: Output: 
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