DataTypes and arguments checker

call .check() upon any function, and pass a string or a function to see if your arguments pass this test, otherwise it will throw an error.

This makes javascript functions to accept static types rather than dynamic, and reduces run-time bugs

example:

function add7(x){
  return x + 7;
}
 
//desired behavior:
add7(3); //returns -> 10
 
//undesired:
add7('3'); //returns -> "37"

//solution:
  add7.check('number',3);  //returns -> 10, just as normal add7()
  add7.check('number','3');  //throws -> Uncaught TypeError: 3 is not of type number 

options:

predefined checkers:

function isInteger(data){
  return data === parseInt(data, 10)
}
add7.check(isInteger,3.4); // Uncaught TypeError: 3.4 is not passing isInteger check

Multiple argumets checks

someFunc(['boolean', Array.isArray, isInteger], true, [23,4,5], 3);

Create a new safe function from your unsafe function, with built-in checks

add7OnlyToInts = add7.check.add(isInteger)
add7OnlyToInts(3.4) //throws

Curry-style your checks:

add7.check.add(isInteger)(3.4)

Read Api_and_example.js for more details.