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Useful data types

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USEFUL DATA

TYPES

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STRING

• A sequence of characters.

• It’s actually from java.lang.String. It’s a Java class.

• A string is immutable.

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ARRAY

• Store fixed size sequential data (must have the same type)

• Default value for a slot depends on its data type.

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ARRAY MAY NEED “IMPORT”

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SET

• Collection of non-duplicated data.

• They have to have the same data type.

• By default, set is immutable.

• Set is not ordered.

–So its member does not have index.

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MAP

• A collection of (key, value) pairs.

• A key is unique.

• you can choose between mutable/immutable map.

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TUPLE

•Collection of values.

•Can contain different data type.

•Tuple is immutable!

•Each touple can only contain upto 22 data.

•Position in a tuple starts from 1.

•Data in a map is actually a tuple.

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OPTION TYPE

• Normally used as a return type

– For example: return an answer or None

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Referensi

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