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Appending to a slice

It is common to append new elements to a slice, and so Go provides a built-in append function. The documentation of the built-in package describes append.

func append(s []T, vs ...T) []T

The first parameter s of append is a slice of type T, and the rest are T values to append to the slice.

The resulting value of append is a slice containing all the elements of the original slice plus the provided values.

If the backing array of s is too small to fit all the given values a bigger array will be allocated. The returned slice will point to the newly allocated array.

(To learn more about slices, read the Slices: usage and internals article.)