How does the operation of adding a new element to a slice work in a programming language?

In Go, a slice is a dynamic array that contains a pointer to an array, a length, and a capacity.

When adding a new element using the append function, the following occurs:

• If the current capacity of the slice is sufficient, the new element is simply added to the existing array, and the length increases.
• If the capacity is insufficient, a new array with increased capacity (usually twice as large) is created, data is copied from the old array to the new one, and the new element is added.

Example:

var s []int
s = append(s, 1) // adds element 1
s = append(s, 2, 3) // adds elements 2 and 3

Thus, append provides a convenient and efficient way to add elements, automatically managing memory.