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Essay---How to understand Val and def in Scala

Source: Internet
Author: User
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def, refers to definition. Is the definition of a function. Define the time functions, functions do not execute, they are prepared for calculus

Val, refers to value. is a phased outcome of the calculation. The part to the right of the equal sign is evaluated to a value, no matter how long. It can be said that a Val is a small computational process. Val is the smallest program unit in which the function is programmed.


var, refers to variable. Their values can be changed to change. var should not participate in the calculation. Because different values of the same var result in inconsistent results for the same calculation.

Essay---How to understand Val and def in Scala

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