ISBN13 check digit: Difference between revisions

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@@ Line 210: / Line 210: @@
 In this example, we set a for loop value as it progresses.
 <lang langur>val .isbn13checkdigit = f(var .s) {
-    var .odd = true
+    var .alt = true
     matching(re/^[0-9]{13}$/, .s = replace(.s, RE/[\- ]/)) and
-        for[=0] .d in map(f .c-'0', s2cp .s) { _for += if(.odd: .d; .d x 3); .odd = not .odd } rem 10 == 0
+        for[=0] .d in map(f .c-'0', s2cp .s) { _for += if(.alt=not .alt: .d x 3; .d) } rem 10 == 0
 }