A clause that translates to the $type operator. It tests to see if the associated attribute is of the specified type, returning a boolean result.
$type
It calls the attribute_type() function.
attribute_type()
The value is the DynamoDB type string to be tested (see https://docs.aws.amazon.com/amazondynamodb/latest/developerguide/Expressions.OperatorsAndFunctions.html#Expressions.OperatorsAndFunctions.Functions)
e.g. { x: { $type: 'L' } } (see if x is a list) => attribute_type(x, :v) (where :v = 'L')
{ x: { $type: 'L' } }
x
attribute_type(x, :v)
:v = 'L'
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A clause that translates to the
$typeoperator. It tests to see if the associated attribute is of the specified type, returning a boolean result.It calls the
attribute_type()function.The value is the DynamoDB type string to be tested (see https://docs.aws.amazon.com/amazondynamodb/latest/developerguide/Expressions.OperatorsAndFunctions.html#Expressions.OperatorsAndFunctions.Functions)
e.g.
{ x: { $type: 'L' } }(see ifxis a list) =>attribute_type(x, :v)(where:v = 'L')