added answer for ch1_q3

Author: kloncentaur8

lib/data-structures/chapter-1/1_3.js

@@ -0,0 +1,20 @@
+module.exports = Strings_1_3 = (function() {
+  return {
+    // Generate URL freindly strings of a specified length
+    // Solution #3 from the book.
+    // @param {String} s - Standard string with potential trailing whitespace
+    // @param {Number} l - The "true" length of the string
+    // @retuns {String} - A URL freindly string of the specified length
+    URLify: function(s, l) {
+      var newString = '';
+      for (var i = 0; i < l; i++) {
+        if (s.charAt(i) === ' '){
+          newString += '%20';
+        }else{
+          newString += s.charAt(i);
+        }
+      }
+      return newString;
+    }
+  };
+}());

test/data-structures/chapter-1/1_3_Spec.js

@@ -0,0 +1,7 @@
+require('../../test_helper');
+describe('1.3 #URLify', function() {
+  it('returns a URL freindly string of the specified length', function() {
+    expect(Strings_1_3.URLify('much ado about nothing          ', 22)).to.be.equal('much%20ado%20about%20nothing');
+    expect(Strings_1_3.URLify('Mr John Smith       ', 13)).to.be.equal('Mr%20John%20Smith');
+  });
+});