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JavaScript JavaScript Functions Arrow Functions Testing for Number Arguments

Kirok James
Kirok James
Full Stack JavaScript Techdegree Student 876 Points

What if both values are not a number

How would you do condition when both numbers are in string and would like to test it in console.log? As long as the conditional statement provides only one option it will always be Error with the message "Provide a lower number" only

Thank you for your anwer

function getRandomNumber(lower, upper = 100) { if(isNaN(lower)) { throw Error("Provide a lower number") }else if (isNaN(upper)){ throw Error("Provide a higher number")


return Math.floor(Math.random() * (upper - lower + 1)) + lower;

} }

console.log( getRandomNumber("five", "six") );

1 Answer

Steven Parker
Steven Parker
228,978 Points

You could start with a conditional that tests both values and gives a different message:

  if (isNaN(lower) && isNaN(upper)) {
    throw Error("Provide two numbers");
  } else   //...