Conversion : how the out put come 1 ???

Question

var a=parseInt("130", 2);

document.write(a);

/* According to my answer came 10

1×2^2 + 3×2^1 + 0×2^0 = 10
*/

/*Please understand me briefly*/

https://code.sololearn.com/W5WNcz0AE7s7/?ref=app

Answer 1

130 is not a valid binary number expression, binary number only has two valid digits, 0 and 1.

The second argument you gave to parseInt was meant as base indicator. When you passed 2, you tell Javascript to treat "130" as a binary number (base 2), but Javascript stop parsing the given string as it finds "3", which is not a valid binary digit.

The expression "130" was then understood as just "1" because the incorrect base specification failed the parsing process.

Answer 2

No it doesn't work like that, the second parameter indicates in wich number system the string should be interpreted, 130 is interpreted as a binary number so 130 is bit 1 bit 3? The parser was like what the hell is this ? A bit with a value 3 ? So it discards all bits after 1 and prints only 1.

Answer 3

Next time please attach the language you need help.

Answer 4

Very very thanx for answering me