Merge pull request #7 from imravichhetri/toLowerCase

toLowerCase implemented

Author: ashokdey

implementations/toLowerCase.js

@@ -0,0 +1,24 @@
+/*
+
+  The toLowerCase() method returns the value of the string converted to lower case.
+  toLowerCase() does not affect the value of the string str itself.
+
+  MDN Link: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/toLowerCase
+
+  Characters from A-Z have ASCII code from 65 - 90.
+  And characters from a-z have ASCII code from 97-122.
+  We're checking this condition to implement this function
+*/
+String.prototype.toLowerCase = function myToLowerCase() {
+  let lowerCaseString = '';
+  for (let i = 0; i < this.length; i += 1) {
+    const character = this[i];
+    const charCode = character.charCodeAt();
+    if (charCode >= 65 && charCode <= 90) {
+      lowerCaseString += String.fromCharCode(charCode + 32);
+    } else {
+      lowerCaseString += character;
+    }
+  }
+  return lowerCaseString;
+};