## Best Way to Check if a Number Contains Another Number

Need to find out if a number contains another number? And you want better performance than converting to a string and then looping through that to find the key number? Well you’ve come to the right place!
Using a combination of the modulo operator and division it’s possible to pull the number apart one digit at a time until it reaches 0.
Implementation Using a Loop Python Go JavaScript C++ Java def checkNumberIfContainsKey(number, key): while number > 0: if number % 10 == key: return True number = number // 10 return False package main import "fmt" func checkNumberIfContainsKey(number, key int) bool { for number > 0 { if number%10 == key { return true } number = number / 10 } return false } func main() { fmt.
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