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bill curry
Front End Web Development Techdegree Student 7,841 PointsUnCaught error: Both arguments must be numbers
Hi, in the random number challenge part II, i keep getting this error message in my console and can't figure out why. Any help?
function getRandomNumber( lower, upper ) {
if ( isNaN(lower) || isNaN(upper) ) {
throw new Error('Both arguments must be numbers');
}
return Math.floor(Math.random() * (upper - lower + 1)) + lower;
}
console.log( getRandomNumber( 9, 24 ) );
console.log( getRandomNumber( 1, 100 ) );
console.log( getRandomNumber( 200, 'five hundred' ) );
console.log( getRandomNumber( 1000, 20000 ) );
console.log( getRandomNumber( 50, 100 ) );
3 Answers
Tom Gooding
16,735 PointsHi Bill,
This is intentional to throw the error as Dave explains in the video.
You are getting this error because you are trying to pass the string of 'five hundred'. The second line of code checks whether the 'upper' and 'lower' are values using the 'isNaN' function. This will return 'true' as the string that you pass is NaN (not a number) and will therefore throw the error on line 3.
bill curry
Front End Web Development Techdegree Student 7,841 PointsThe way the error was displaying, I thought it was a problem with the syntax of 'Both must be numbers.' Thanks for your help.
Damjan Bozinovski
9,916 PointsBut shouldn't it run to a certain point when the isNaN is true? For example get the first two lines in the console done, then run the error?