[Go - slice] Remove Elements from a slice in Go

Go has a special indexing syntax that forms the basis of removing one or more elements from a slice. I will teach you this syntax and show you its various forms.

Based upon that, I'll show you how to remove a single element from a slice. However, you may find this somewhat limiting. I also will show you a more typical example of removing elements from a slice as we iterate over it. This technique shows you how to remove multiple elements from a slice.

func main() {
	all, err := loadChampions()
	if err != nil {
		log.Fatalf("An error occurred loading/parsing champions, err=%v", err)
	}
    
    // get 0 to 19
	some := all[0:20]
    // get 0 to 19
	some = all[:20]
    // get 10 to the end
	some = all[10:]
    // get all
	some = all[:]

	// Remove an element from the slice by index
    // ... spread operator
    // since append expects individual elements as its second and subsequent arguments, 
    // the ... operator is used to expand the second slice (all[11:]) into a series of arguments
    // So the 10th element is removed
	most := append(all[0:10], all[11:]...)
    
    // Remove element with new slice
    var filtered []champion
    for _, champ := range all {
        if !champ.hasClass("Sorcerer") {
            filtered = append(filtered, champ)
        }
    }

	// Remove elements by altering the slice in place
	index := 0
	for _, champ := range all {
		if champ.hasClass("Sorcerer") {
			continue
		}

		all[index] = champ
		index++
	}

	all = all[:index]
}