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JavaScript JavaScript Basics (Retired) Working With Numbers Numbers and Strings

Posted by John Martens
John Martens
8,689 Points

What about just using Number to convert to a number? var age = Number(prompt("How old are you?"));

I think this works too, but maybe not as precise?

2 Answers

moonshine
moonshine
8,449 Points

According to this answer on stack overflow:

console.log(Number("500px") );          /* output is NaN */
console.log(Number.parseInt("500px") ); /* output is 500 */
John Martens
John Martens
8,689 Points
John Martens
John Martens
8,689 Points

Oh, I think I see.. Number will work if it is a string that ONLY contains numbers, but not if there are other things attached. If someone answers '30' as their age in the prompt it should work, but if they answered '30 years old' it would only work as parseInt. Thanks for your reply.