Is parseInt() supposed to work like this?

Question

If I write this script :

alert(parseInt(\"123blahblahblah456\"));

I get the alert with the value 123

Ideally, shouldn\'t th

Answer 1

parseInt attempts to parse the string until it finds a non-integer value, at which point it returns whatever it had.

So if the string is:

• 1234abcd - it returns 1234
• 1a3f - it returns 1
• a14883 - it returns NaN
• 1.5 - it returns 1
• -1.3a - it returns -1

Same with parseFloat except that won't break on a .

• 1234abcd - it returns 1234
• 1a3f - it returns 1
• a14883 - it returns NaN
• 1.5 - it returns 1.5
• -1.3a - it returns -1.3