Find all anagrams in a string

anagrams1.go

// Use the sliding window method
func findAnagrams(full string, anagram string) []int {
    var (
        result []int
        sample = []rune(full)
        gram = make(map[rune]int)
        mirror = make(map[rune]int)
    )
    
    for _, character := range anagram {
        gram[character]++
    }
    
    windowStart := 0
    windowLength := len(anagram)
    anagramStart := 0
    reset := true
    
    for index := 0; index < len(sample); index++ {
        if windowStart + windowLength == index {
            windowStart++
            index = windowStart
            mirror = make(map[rune]int)
            reset = true
        }
        
        character := sample[index]
        
        if _, ok := gram[character]; ok {
            if reset {
                anagramStart = index
            }
            mirror[character]++
            reset = false 
        } else {
            reset = true
            windowStart = index
            if len(mirror) > 0 {
                mirror = make(map[rune]int)
            }
            continue
        } 
        
        if reflect.DeepEqual(gram, mirror) {
            result = append(result, anagramStart)
        }
    }
    
    return result
}

anagrams2.go

// Use the sliding window method
func findAnagrams(full string, anagram string) []int {
    var (
        result []int
        sample = []rune(full)
        gram = make(map[rune]int)
        mirror = make(map[rune]int)
    )
    
    for _, character := range anagram {
        gram[character]++
        mirror[character]++
    }
    
    windowStart := 0
    windowLength := len(anagram)
    anagramStart := 0
    reset := true
    
    for index := 0; index < len(sample); index++ {
        if windowStart + windowLength == index {
            windowStart++
            index = windowStart
            mirror = copyMap(gram)
            reset = true
        }
        
        character := sample[index]
        
        if _, ok := gram[character]; ok {
            if reset {
                anagramStart = index
            }
            mirror[character]--
            if mirror[character] == 0 {
                delete(mirror, character)
            }
            reset = false 
        } else {
            reset = true
            windowStart = index
            if len(mirror) > 0 {
                mirror = copyMap(gram)
            }
            continue
        } 
        
        if len(mirror) == 0 {
            result = append(result, anagramStart)
        }
    }
    
    return result
}

func copyMap(input map[rune]int) map[rune]int {
    var result = make(map[rune]int, len(input))
    
    for key, value := range input {
        result[key] = value
    }
    
    return result
}