Go: Make slices, maps and channels
Slices, maps and channels can be created with the built-in make
function. The memory is initialized with zero values.
Call | Type | Description |
---|---|---|
make(T, n) |
slice | slice of type T with length n |
make(T, n, c) |
capacity c | |
make(T) |
map | map of type T |
make(T, n) |
initial room for approximately n elements | |
make(T) |
channel | unbuffered channel of type T |
make(T, n) |
buffered channel with buffer size n |
s := make([]int, 10, 100) // slice with len(s) == 10, cap(s) == 100
m := make(map[string]int, 100) // map with initial room for ~100 elements
c := make(chan int, 10) // channel with a buffer size of 10
Slices, arrays and maps can also be created with composite literals:
s := []string{"f", "o", "o"} // slice with len(s) == 3, cap(s) == 3
a := [...]int{1, 2} // array with len(a) == 2
m := map[string]float64{ // map with two key-value elements
"e": 2.71828,
"pi": 3.1416,
}
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