op-geth/trie/slice.go

package trie

import (
	"bytes"
	"math"
)

// Helper function for comparing slices
func CompareIntSlice(a, b []int) bool {
	if len(a) != len(b) {
		return false
	}
	for i, v := range a {
		if v != b[i] {
			return false
		}
	}
	return true
}

// Returns the amount of nibbles that match each other from 0 ...
func MatchingNibbleLength(a, b []byte) int {
	var i, length = 0, int(math.Min(float64(len(a)), float64(len(b))))

	for i < length {
		if a[i] != b[i] {
			break
		}
		i++
	}

	return i
}

func HasTerm(s []byte) bool {
	return s[len(s)-1] == 16
}

func RemTerm(s []byte) []byte {
	if HasTerm(s) {
		return s[:len(s)-1]
	}

	return s
}

func BeginsWith(a, b []byte) bool {
	if len(b) > len(a) {
		return false
	}

	return bytes.Equal(a[:len(b)], b)
}