Data commit

Task/Substring/Wren/substring.wren

@@ -0,0 +1,26 @@
+import "/str" for Str
+
+var s  = "αβγδεζηθ"
+var n = 2
+var m = 3
+var kc = "δ"  // known character
+var ks = "δε" // known string
+// for reference
+System.print("Index of characters:  01234567")
+System.print("Complete string:      %(s)")
+// starting from n characters in and of m length
+System.print("Start %(n), length %(m):    %(Str.sub(s, n...n+m))")
+// starting from n characters in, up to the end of the string
+System.print("Start %(n), to end:      %(Str.sub(s, n..-1))")
+// whole string minus last character
+System.print("All but last:         %(Str.sub(s, 0..-2))")
+// starting from a known character within the string and of m length
+var dx = s.indexOf(kc)
+if (dx >= 0) {
+    System.print("Start '%(kc)', length %(m):  %(Str.sub(s[dx..-1], 0...m))")
+}
+// starting from a known substring within the string and of m length
+var sx = s.indexOf(ks)
+if (sx >= 0) {
+    System.print("Start '%(ks)', length %(m): %(Str.sub(s[sx..-1], 0...m))")
+}