len方法未定义

Question

I've been reading the [golang-book]: http://www.golang-book.com and completing the excercises as I go along. In Chapter 6, there is an exercise that must find the smallest element in an unsorted list[x].

I have the following code but somehow I don't know why the method length (len) gives me an error on line 14: x.len undefined (type []int has no field or method len)

package main

import "fmt"

func main() {
    x := []int{
        48, 96, 86, 68,
        57, 82, 63, 70,
        37, 34, 83, 27,
        19, 97, 9, 17,
    }

    small := x[0]
    for i := 1; i < x.len(); i++ {
        if x[i] < small {
            fmt.Println(x[i])
        }
    }
}

The logic I used was Googled so perhaps there is no len method on arrays? Any help is greatly appreciated.

Answer 1

Arrays and slices do not have a len() method. The len() function is a language built-in.

So your code

for i := 1; i < x.len(); i++ {

Should be

for i := 1; i < len(x); i++ {

Here is a working version in the playground.

package main

import "fmt"

func main(){
    x := []int{
        48,96,86,68,
        57,82,63,70,
        37,34,83,27,
        19,97, 9,17,
    }   

    small := x[0]
    for i := 1; i < len(x); i++ {
        if x[i] < small { 
        fmt.Println(x[i]);
        }
    }
}