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Mytech T
Full Stack JavaScript Techdegree Student 1,427 PointsIs this solution acceptable?
check this solution, please.
const random = (upper, lower) => typeof(upper,lower) === 'number' ? Math.floor(Math.random() * (upper - lower + 1)) + lower : `That's not a number`
console.log(random(20, 10))
4 Answers
Steven Parker
231,275 PointsYou can only use "typeof" on one thing at a time.
If I try "console.log(random(20, "Joe"))" I get "That's not a number"
But if I try "console.log(random("Joe", 10))" I just get "NaN"
Mytech T
Full Stack JavaScript Techdegree Student 1,427 PointsSteven Parker, but it worked, try it on the console?
Steven Parker
231,275 PointsSee the examples added to my answer.
Mytech T
Full Stack JavaScript Techdegree Student 1,427 PointsSteven Parker, Yep, you right👍
Joseph Lander
Full Stack JavaScript Techdegree Graduate 27,765 PointsI think this is interesting as to the difference between isNaN() and typeof X === 'number'. [I figure they must be different or why would both exist?]
I wrote a similar logic with typeof before watching the solution. To explore the difference I changed my upper number check to isNaN and ran the following code:
const randomNumber = (lower, upper) => {
if (typeof lower !== 'number' || isNaN(upper)) {
throw Error('parameters are not both numbers');
}
return Math.floor(Math.random() * (upper - lower + 1)) + lower;
};
console.log(randomNumber(2, '4')); // 4 as a string is coerced/considered a number
console.log(randomNumber('two', 4)); // 'two' does NOT get coerced/considered a number - throws error
Joseph Lander
Full Stack JavaScript Techdegree Graduate 27,765 PointsPS Like your use of a ternary Mytech T. More concise than mine.