How should I practice Identification Number Check Digit?

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Identification Number Check Digit

Abridge● EasyFULLTIMEOA

Problem statement

You are given an identification number as a digit string identificationNumber. Compute its check digit.

Number positions from the left, starting at 0.
Add the digits at even positions and multiply that sum by 3.
Add the digits at odd positions to get a total.
Return the amount needed to reach the next multiple of 10. If the total is already a multiple of 10, return 0.

Equivalently, return (10 - total % 10) % 10.

Practice details

For this exercise, assume positions are counted from the left and the number is supplied as a string of decimal digits. Keep any leading zeros and count positions before converting individual digits.

Function

checkDigit(identificationNumber: String) → int

Examples

Example 1

identificationNumber = "39847"return = 3

Even positions contain 3, 8, and 7, giving 18. Tripling gives 54. Adding 9 + 4 gives 67. The next multiple of 10 is 70, so return 3.

Example 2

identificationNumber = "12"return = 5

Position 0 contains 1, so the total is 3 * 1 + 2 = 5. Adding 5 reaches 10.

Example 3

identificationNumber = "0"return = 0

The total is already 0, a multiple of 10, so the check digit is 0.

Constraints

The digit string has length from 1 to 12.
Every character is a decimal digit from 0 through 9.