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add-binary.js

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/**

* @param {string} a

* @param {string} b

* @return {string}

*/

// Using Ret as an array

var addBinary = function (a, b) {

var a_arr = a.split('');

var b_arr = b.split('');

var lena = a.length;

var lenb = b.length;

if (lena < lenb) {

for (var k = 0; k < lenb - lena; k++) {

a_arr.unshift(0);

}

}

if (lenb < lena) {

for (var kk = 0; kk < lena - lenb; kk++) {

b_arr.unshift(0);

}

}

//a is longer than b

var carry = 0;

var ret = [];

for (var i = a_arr.length - 1; i >= 0; i--) {

var sum = parseInt(a_arr[i]) + parseInt(b_arr[i]) + carry;

if (sum >= 2) {

carry = 1;

sum = sum % 2;

ret.unshift(sum);

} else {

carry = 0;

ret.unshift(sum);

}

}

if (carry > 0) {

ret.unshift(carry);

}

return ret.join('');

};

// Using ret as a string

/**

* @param {string} a

* @param {string} b

* @return {string}

*/

var addBinary = function (a, b) {

var ret = "";

var len1 = a.length;

var len2 = b.length;

if (len1 === 0 && len2 === 0) {

return ret;

} else if (len1 === 0) {

return b;

} else if (len2 === 0) {

return a;

} else {

if (len1 < len2) {

for (var i = 0; i < len2 - len1; i++) {

a = '0' + a;

}

} else if (len1 > len2) {

for (i = 0; i < len1 - len2; i++) {

b = '0' + b;

}

}

// guarantee that a and b are the same length

var len = a.length;

var carry = 0;

for (i = len - 1; i >= 0; i--) {

var sum = parseInt(a[i]) + parseInt(b[i]) + carry;

if (sum >= 2) {

carry = 1;

sum = sum % 2;

} else {

carry = 0;

}

ret = sum + ret;

}

if (carry === 1) {

ret = carry + ret;

}

return ret;

}

};