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初级 go 程序员

package fac
func factorial(n int) int {
    res := 1
    for i := 1; i <= n; i {
        res *= i
    }
    return res
}

学会了使用函数

package fac
func factorial(n int) int {
    if n == 0 {
        return 1
    } else {
        return factorial(n - 1) * n
    }
}

学会如何在 go 中使用泛型编程

package fac
func factorial(n interface{}) interface{} {
    v, valid := n.(int)
    if !valid {
        return 0
    }
    res := 1
    for i := 1; i <= v; i {
        res *= i
    }
    return res
}

多线程优化过的 go 程序员

package fac
import "sync"
func factorial(n int) int {
    var (
        left, right = 1, 1
        wg sync.waitgroup
    )
    wg.add(2)
    pivot := n / 2
    go func() {
        for i := 1; i < pivot; i {
            left *= i
        }
        wg.done()
    }()
    go func() {
        for i := pivot; i <= n; i {
            right *= i
        }
        wg.done()
    }()
    wg.wait()
    return left * right
}

学会了使用 go 设计模式的程序员

package fac
func factorial(n int) <-chan int {
    ch := make(chan int)
    go func() {
        prev := 1
        for i := 1; i <= n; i {
            v := prev * i
            ch <- v
            prev = v
        }
        close(ch)
    }()
    return ch
}

学会使用成熟方案弥补 go 的不足

package fac
/**
 * @see https://en.wikipedia.org/wiki/factorial
 */
type ifactorial interface {
    calculatefactorial() int
}
// factorialimpl implements ifactorial.
var _ ifactorial = (*factorialimpl)(nil)
/**
 * used to find factorial of the n.
 */
type factorialimpl struct {
    /**
     * the n.
     */
    n int
}
/**
 * constructor of the factorialimpl.
 *
 * @param n the n.
 */
func newfactorial(n int) *factorialimpl {
    return &factorialimpl{
        n: n,
    }
}
/**
 * gets the n to use in factorial function.
 *
 * @return int.
 */
func (this *factorialimpl) getn() int {
    return this.n
}
/**
 * sets the n to use in factorial function.
 *
 * @param n the n.
 * @return void.
 */
func (this *factorialimpl) setn(n int) {
    this.n = n
}
/**
 * returns factorial of the n.
 *
 * @todo remove "if" statement. maybe we should use a factory or somthing?
 *
 * @return int.
 */
func (this *factorialimpl) calculatefactorial() int {
    if this.n == 0 {
        return 1
    }
    n := this.n
    this.n = this.n - 1
    return this.calculatefactorial() * n
}

资深 go 程序员

package fac
// factorial returns n!.
func factorial(n int) int {
    res := 1
    for i := 1; i <= n; i {
        res *= i
    }
    return res
}

rob pike（golang 创始人之一）

package fac
// factorial returns n!.
func factorial(n int) int {
    res := 1
    for i := 1; i <= n; i {
        res *= i
    }
    return res
}

改编自 ““.

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原文地址：

译文地址：https://learnku.com/go/t/40983