golang slice check if element exists

Go's Slice type provides a convenient and effective way to process typed data sequences.

Slice is similar to an array in other languages, but has some unusual properties. (Recommended learning: go)

Slices

Arrays have their place, but they are a bit inflexible, so you won't find them in Go code They are often seen in . However, Slice is everywhere. They are array-based and provide powerful functionality and convenience.

The type specification of Slice is [] T, where T is the type of Slice element. Unlike array types, Slice types do not have a specified length.

A Slice literal is declared just like an array literal, except the number of elements is omitted:

letters := []string{"a", "b", "c", "d"}

Slices can be created using a built-in function called make, which has the following definition,

func make([]T, len, cap) []T

Where T represents the element type of the slice to be created. The make function takes a type, length and optional capacity. When called, make allocates an array and returns a slice referencing the array.

var s []byte
s = make([]byte, 5, 5)
// s == []byte{0, 0, 0, 0, 0}

When the capacity parameter is omitted, it defaults to the specified length. Here's a more concise version of the same code:

s := make([]byte, 5)

The length and capacity of a slice can be checked using the built-in len and cap functions.

len(s) == 5
cap(s) == 5

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