Add simple example of isNaN()

[ManuelOviedo]

#31

[TheSTL]

Hello @ManuelOviedo ,
We need native implementation of isNan function.

[ManuelOviedo]

Hello @ManuelOviedo ,
We need native implementation of isNan function.

There's no prototype of isNaN. That property comes from ECMAScript convention for evaluate if a given value is NaN, if you get to the MDN links there are some links to its own ECMAScript related articles.
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/NaN
https://tc39.es/ecma262/#sec-value-properties-of-the-global-object-nan

[TheSTL]

Can you write a program which simple take a string as an input and check if its a number or not.
If it's a number return false, else return true. @ManuelOviedo

[ManuelOviedo]

Can you write a program which simple take a string as an input and check if its a number or not.
If it's a number return false, else return true. @ManuelOviedo

I think you missunderstood the purpose of that function. isNaN checks for a value if it's NOT a number and i guess my example is way too clear:

Number.prototype.isNaN = function(testValue){
return isNaN(testValue);
};
the above example (same as PR) receives a value and evaluates it with isNaN function and will return true if it's not a number or false if it's a number

[TheSTL]

Implementation should be done without using in-build functions or specifically don't use isNaN function, or parseInt type of functions