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A checksum is a small chunk of data calculated from another larger piece of data, used to detect any transmission errors in the data. Use this tag for questions related to calculating or verifying checksums. (See also hashing)

1 vote

Calculate ISBN-13 check digit

Groovy 75, 66 chars i={int i;it+(10-it.inject(0){t,c->t+(i++&1?:3)*(c as int)}%10)%10} use: String z = "978030640615" println i(z) -> 9780306406157
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