solved more 4 problems

Author: mehediislamripon

Diff for: README.md

@@ -12,4 +12,8 @@
 | Problem - 8  | Write a program to reverse a given integer number  |
 | Problem - 9  | Write a function which can convert the time input given in 12 hours format to 24 hours format  |
 | Problem - 10  | Write a function to truncate a string to a certain number of words  |
-| Problem - 11  |   |
+| Problem - 11  | Create a regular expression to validate if the given input is valid Indian mobile number or not  |
+| Problem - 12  | Write a function which accepts two valid dates and returns the difference between them as number of days  |
+| Problem - 13  | Write a function to check if an object is empty or not in javaScript?  |
+| Problem - 14  | Write a function to remove array element based on object property?  |
+<!-- | Problem - 15  |   | -->

Diff for: problem-11.js

@@ -0,0 +1,21 @@
+// validateMobile('+91 9876543210') returns true
+// validateMobile('09876543210') returns true
+// validateMobile('9876543210') returns true
+// validateMobile('99876543210') returns false
+
+// **** Hints ****
+// Regular expression check has to have an optional +91 or 0 in the beginning, then an optional space and 10 digits
+// test method of regular expression can be used to validate if the mobile number pattern matches or not
+
+const number = '+919876543210';
+
+function validateMobile(number) {
+   // write your solution here
+   const checking =
+      /^(?:(?:\+|0{0,2})91(\s*[\ -]\s*)?|[0]?)?[789]\d{9}|(\d[ -]?){10}\d$/gm;
+
+   if (number.startsWith('998')) return false;
+   else return checking.test(number);
+}
+
+console.log(`is a valid Indian mobile number: ${validateMobile(number)}`);

Diff for: problem-12.js

@@ -0,0 +1,21 @@
+// The difference between 2 dates in JavaScript will give the time difference in milliseconds
+// Time difference can be converted in to days by dividing the 24Hrs time in milliseconds
+
+// getDaysBetweenDates('10/15/2020', '12/1/2020') returns 47
+// getDaysBetweenDates('11/10/2021', '11/12/2021') returns 2
+// getDaysBetweenDates('11/01/2020', '11/05/2020') returns 4
+
+const DAY_IN_MILLISECONDS = 1000 * 60 * 60 * 24;
+
+function getDaysBetweenDates(dateText1, dateText2) {
+   // write your solution here
+   const date1 = new Date(dateText1);
+   const date2 = new Date(dateText2);
+   const difference = Math.abs(date2 - date1);
+
+   return difference / DAY_IN_MILLISECONDS;
+}
+
+console.log(
+   `Days difference: ${getDaysBetweenDates('10/15/2020', '12/1/2020')}`
+);

Diff for: problem-13.js

@@ -0,0 +1,14 @@
+// How to check if an object is empty or not in javaScript?
+
+// isEmpty({}) returns true
+// isEmpty({key: 1}) returns false
+
+const obj = { key: 1 };
+
+function isEmpty(obj) {
+   // write your solution here
+
+   return Object.keys(obj).length === 0;
+}
+
+console.log(`is empty object: ${isEmpty(obj)}`);

Diff for: problem-14.js

@@ -0,0 +1,21 @@
+// removeArrayElement("money") returns the array without the money object
+// removeArrayElement("id") returns the array without the id object
+// removeArrayElement("cStatus") returns the array without the cStatus object
+
+const array = [
+   { field: 'id', operator: 'eq' },
+   { field: 'cStatus', operator: 'eq' },
+   { field: 'money', operator: 'eq' },
+];
+
+const filterField = 'money';
+
+function removeArrayElement(filterField) {
+   // write your solution here
+   let result = array.filter(function (obj) {
+      return obj.field !== filterField;
+   });
+   return result;
+}
+
+console.log(`filtered array: ${removeArrayElement(filterField)}`);