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JavaScript JavaScript Functions Arrow Functions Function Challenge Solution

Posted by Silvia Ramos
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Silvia Ramos
Front End Web Development Techdegree Graduate 18,318 Points

Using arrows

Hi there :)

Please, can someone check if this solution would be correct? I was using the arrows form before checking the teacher's solution, and looks like it works, but I am not sure if it would be a proper solution for this? Also, I am not sure either about using LET and CONST on this exercise.

Many thanks :))))

let getRandomNumber = (upper, lower) => {
const randomNumber = (Math.floor(Math.random() * (upper - lower + 1)) + lower) 
  return randomNumber
};

 getRandomNumber(23, 8);

3 Answers

Guil Hernandez
STAFF
Guil Hernandez
Treehouse Teacher
Guil Hernandez
Guil Hernandez
Treehouse Teacher

That's absolutely correct. Nice work, @Silvia Ramos!

let works in this case, and it's perfectly acceptable. Because you're assigning getRandomNumber a function, it'd be safer to use const to prevent the getRandomNumber variable from being reassigned and losing the important functionality provided by getRandomNumber :) For example,

let getRandomNumber = (upper, lower) => {
const randomNumber = (Math.floor(Math.random() * (upper - lower + 1)) + lower) 
  return randomNumber
};
getRandomNumber(23, 8);  // 11

getRandomNumber = 5; // uh oh
getRandomNumber(100, 50);  // Uncaught TypeError: getRandomNumber is not a function
Silvia Ramos
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.a{fill-rule:evenodd;}techdegree seal-36
Silvia Ramos
Front End Web Development Techdegree Graduate 18,318 Points
Silvia Ramos
.a{fill-rule:evenodd;}techdegree seal-36
Silvia Ramos
Front End Web Development Techdegree Graduate 18,318 Points

Hi Guil!

I see, thank you so much :)) makes sense to use CONST instead :) Thanks for your assistance :) As a note, you are being amazing throughout this course! (getting slow at understanding as my background on computers and programming was limited to switch on/off my laptop haha, but you make it 'easy'!) so glad I have joined TreeHouse!

Jason Cheung
Jason Cheung
3,227 Points
Jason Cheung
Jason Cheung
3,227 Points

just wondering if I could simplify the code I have here.

function getRandomNumber(lower=1, upper=100) {
    const randomNumber = Math.floor(Math.random() * (upper - lower + 1) ) + lower;
    return randomNumber;
  }
  const lower = prompt("Enter the minimum number");
  const upper = prompt("enter the maximum number");
  if (Number.isInteger(+lower)===true){
      if (Number.isInteger(+upper) === true){
    alert(`${getRandomNumber(parseInt(lower), parseInt(upper))} is the random number between ${lower} and ${upper}`)
      }else{
        alert("Please enter numeric numbers")
    }
  }else{
      alert("Please enter numeric numbers")
  }

I have done much more than what it requested, but I think this is more interactive and can be an more user-friendly generator