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The operator is most often used to guard against null values.
encode()
The encode() operator returns a string containing the JSON representation of the data structure to which it is applied. For example:
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The encode() operator takes an optional positive integer argument specifying that the object should be pretty printed (if it contains or is a map or array) with newlines and indents with that number of spaces.
isnull()
The isnull() operator returns true of the object is null (undefined) and false otherwise.
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