Implement 'M.check()'

[fave77]

Do the checklist before filing the issue:

• [x] Do you have Node.js and all the relevant dev-dependencies installed?
• [ ] Is this a bug fix?
• [x] Is this an enhancement?
• [x] Is this a feature request?

NOTE: Provide a clear and concise description of the feature that needs to be added! Or if its a bug, then provide the necessary steps to reproduce it along with screenshots.

• Give your answer below:

---

• Function: M.check()
• Argument: String
• Return-Type: Function
• Usage:

  
  const isPrime = M.check('prime');    /* returns the function for checking a prime number */
  isPrime(7);    /* true */

/ OR /

M.check('prime')(18); / false / M.check('palindrome')(151); / true /

- Implementation:
  - Inside the module **check**, provide an _index.js_:
  ```js
  module.exports = arg => {
    /* first validate the argument here ... */
   /* return the corresponding function */
    return require(`../${arg}`).check;
  };

• Changes:
  • Test this feature by only tweaking prime module i.e. you need to change line 7:

    exports.isPrime = num => {
    /* should change into */
    exports.check = num => {

  • Similarly, also make changes in prime-spec.js, in line 3:

    isPrime = prime.isPrime,
    /* should change into */
    isPrime = prime.check,

  • Accordingly, make changes in src/index.js and remove any isPrime hooks and add check module via which we can access isPrime or for checking any numbers.

[NOTE: M.isPrime() will be deprecated after resolving this issue and similarly, within the next few weeks, we're gonna migrate to M.check() for checking all the numbers. Do not change any other number module for now, just stick with prime. A separate issue will be opened for that once this one gets successfully resolved.]

[abdus]

Assign this to me, please.

[fave77]

@thisisabdus you're assigned!

[fave77]

@thisisabdus your time's up!

[abdus]

Hey I am reclaiming this issue. I was busy with some other stuffs.

[fave77]

@thisisabdus okay I giving you another shot at this but please don't claim any issue if you're not sure you'll be able to resolve it within the stipulated time!

[abdus]

A few things comes in an unexpected way!