How should I practice Alternating Signed Digit Sum?

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Alternating Signed Digit Sum

ZipRecruiter● EasyNEW GRADOA

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Problem statement

You are given a nonempty decimal string digits. Read it from left to right using zero-based positions.

Add digits at even positions and subtract digits at odd positions. Return the resulting signed sum.

Function

alternatingDigitSum(digits: String) → int

Examples

Example 1

digits = "521"return = 4

The result is 5 - 2 + 1 = 4.

Example 2

digits = "12345"return = 3

The result is 1 - 2 + 3 - 4 + 5 = 3.

Constraints

1 <= digits.length <= 100000
digits contains only decimal digits.