Initial data commit

Task/Substring/JavaScript/substring-1.js

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+var str = "abcdefgh";
+
+var n = 2;
+var m = 3;
+
+//  *  starting from n characters in and of m length;
+str.substr(n, m);  // => "cde"
+
+//  * starting from n characters in, up to the end of the string;
+str.substr(n);  // => "cdefgh"
+str.substring(n);  // => "cdefgh"
+
+//  * whole string minus last character;
+str.substring(0, str.length - 1);  // => "abcdefg"
+
+//  * starting from a known character within the string and of m length;
+str.substr(str.indexOf('b'), m);  // => "bcd"
+
+//  * starting from a known substring within the string and of m length.
+str.substr(str.indexOf('bc'), m);  // => "bcd"