CODEWITHSUNDEEP
javascriptbinaryconvertersradix
jona
jona

Reputation: 399

parseInt() doesn't regard leading zeros, even with radix

When I want to convert a binary string to a base 10 decimal (Like this: parseInt('0001010', 2)), Javascript returns a decimal number, but a version in which the leading zeros mentioned in the example above have been disregarded. Is there any way to fix this?

Upvotes: 0

Views: 175

Answers (2)

user4396006
user4396006

Reputation:

So supposing you have the number '00000101101101':

var number = '00000101101101';
var length = number.length;
var decimal_number = parseInt(number, 2);

// going back

var new_number = decimal_number.toString(2);
var new_length = new_number.length;
var n_zeros = length - new_length;
var zeros = (n_zeros >= 2 ? Array(n_zeros+1).join("0") : "0");
new_number = zeros + new_number;

Upvotes: 1

NPE
NPE

Reputation: 500307

The decimal representation has no way to keep track of leading zeros. If you wish to keep the leading zeros in the result, you need a fundamentally different approach (e.g. keeping the output as a string).

Alternatively, if you know the width of the result a priori, you could just pad it with leading zeros on output.

Upvotes: 1

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