1 Building Abstractions with Functions

标签：

Every powerful language has three such mechanisms:

• primitive expressions and statements, which represent the simplest building blocks that the language provides,
• means of combination, by which compound elements are built from simpler ones, and
• means of abstraction, by which compound elements can be named and manipulated as units.

A critical aspect of a programming language is the means it provides for using names to refer to computational objects. If a value has been given a name, we say that the name binds to the value.

nested expression (嵌套表达式)
Pure function and Non-Pure functions

function abstraction (将计算过程抽象成函数)

To master the use of a functional abstraction, it is often useful to consider its three core attributes. The domain of a function is the set of arguments it can take. Therange of a function is the set of values it can return. The intent of a function is the relationship it computes between inputs and output (as well as any side effects it might generate)

Decomposing a complex task into concise functions
some ideas of good function：

• Each function should have exactly one job
• Don‘t repeat yourself
• Functions should be defined generally

Higher-order Functions

• Functions as Arguments
• Functions as General Methods
• Functions as Returned Values

闭包(closure)

科里化(currying)

2015-07-18

1 Building Abstractions with Functions

标签：

原文地址：http://www.cnblogs.com/whuyt/p/4656296.html