Data commit

Task/Symmetric-difference/Ksh/symmetric-difference.ksh

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+#!/bin/ksh
+
+# Symmetric difference - enumerate the items that are in A or B but not both.
+
+#	# Variables:
+#
+typeset -a A=( John Bob Mary Serena )
+typeset -a B=( Jim Mary John Bob )
+
+#	# Functions:
+#
+#	# Function _flattenarr(arr, sep) - flatten arr into string by separator sep
+#
+function _flattenarr {
+	typeset _arr ; nameref _arr="$1"
+	typeset _sep ; typeset -L1 _sep="$2"
+	typeset _buff
+	typeset _oldIFS=$IFS ; IFS="${_sep}"
+
+	_buff=${_arr[*]}
+	IFS="${_oldIFS}"
+	echo "${_buff}"
+}
+
+#	# Function _notin(_arr1, _arr2) - elements in arr1 and not in arr2
+#
+function _notin {
+	typeset _ar1 ; nameref _ar1="$1"
+	typeset _ar2 ; nameref _ar2="$2"
+	typeset _i _buff _set ; integer _i
+
+	_buff=$(_flattenarr _ar2 \|)
+	for((_i=0; _i<${#_ar1[*]}; _i++)); do
+		[[ ${_ar1[_i]} != @(${_buff}) ]] && _set+="${_ar1[_i]} "
+	done
+	echo ${_set% *}
+}
+
+ ######
+# main #
+ ######
+
+AnB=$(_notin A B) ; echo "A - B   = ${AnB}"
+BnA=$(_notin B A) ; echo "B - A   = ${BnA}"
+echo "A xor B = ${AnB} ${BnA}"