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It generates a new append copies pointer passed by reference 1. The package main

Import ( 
    " FMT " 
) 

FUNC W (S [] int ) [] int { 
    fmt.Printf ( " in # V% V% W " , S, S & [ 0 ]) 
　　// append s after the designated pointer to the new memory copy , no longer point to the original memory 
    S = the append (S, 0 ) 
    fmt.Printf ( " After the append # V% V% W " , S, S & [ 0 ])
     return S 
} 

FUNC main () { 
    S: = [ ] int { . 1 } 
    fmt.Printf ( " OUT of # V% V% W " , S, S & [ 0]) 
    S2: = W (s) 
    content // s original pointer remains in memory, instead of being covered / GC of 
    fmt.Printf ( " After W V% V%%% # V # V " , s, S & [ 0 ], S2, S2 & [ 0 ]) 
}

output:

out of w [1] (*int)(0x40e020) in w [1] (*int)(0x40e020) after append w [1 0] (*int)(0x40e040) after w [1] (*int)(0x40e020) [1 0] (*int)(0x40e040)