node school functional javascript

gistfile1.txt

/*
uppercase everything

*/
module.exports = function(input) {
  
  return input.toString().toUpperCase();
}

/*
make a higher order function
*/

function repeat(operation, num) {
  for(i=0;i<num;i++){
  	operation();
  
  }
}

module.exports = repeat

/*
use map to double
*/

function doubleAll(numbers) {
  return numbers.map(double);
}

var double = function(single) {
  return single *2; 
}

module.exports = doubleAll

/*
array method chaining
*/

module.exports = function getShortMessages(messages) {
	return messages.filter(isBigEnough)
				   .map(simpler);

}

function isBigEnough(element) {
 // console.log(element.message);
  if(element.message.length< 50){
	  return element.message;
	}
}

function simpler(element){
	return element.message;
}

/*
every some
*/

module.exports = function checkUsersValid(goodUsers) {
  return function(submittedUsers) {
    return submittedUsers.every(function(element){
    	//console.log(element.id);
    	return (goodUsers.some(
    		function(user){
    		//console.log(user.id);
    		return element.id === user.id;
    		}
    	));
    	
    }
    )
  };
}