Sum Strings

Codewars kata.

It's supposed to be able to handle big integers.

Question

Given the string representations of two integers, return the string representation of the sum of those integers.

For example:

sumStrings('1','2') // => '3'

A string representation of an integer will contain no characters besides the ten numerals "0" to "9".

Solution

"use strict";
const reverseArr = s => s.split("").reverse();
function sumStrings(a, b) {
 [a, b] = [reverseArr(a), reverseArr(b)];
 let carry = 0;
 const arr = []
 const [mx, mn] = (a.length >= b.length) ? [a, b] : [b, a];
 mx.forEach((itm, idx) => {
 let sm = Number(itm) + (Number(mn[idx]) || 0) + carry;
 [sm, carry] = sm > 9 ? [sm%10, 1] : [sm, 0];
 arr.unshift(sm)
 })
 if (carry) arr.unshift(carry);
 return arr.join("").replace(/^(0+)/, "");
}

Sum Strings

Codewars kata.

It's supposed to be able to handle big integers.

Question

Given the string representations of two integers, return the string representation of the sum of those integers.

For example:

sumStrings('1','2') // => '3'

A string representation of an integer will contain no characters besides the ten numerals "0" to "9".

Solution

"use strict";
const reverseArr = s => s.split("").reverse();
function sumStrings(a, b) {
 [a, b] = [reverseArr(a), reverseArr(b)];
 let carry = 0;
 const arr = []
 const [mx, mn] = (a.length >= b.length) ? [a, b] : [b, a];
 mx.forEach((itm, idx) => {
 let sm = Number(itm) + (Number(mn[idx]) || 0) + carry;
 [sm, carry] = sm > 9 ? [sm%10, 1] : [sm, 0];
 arr.unshift(sm)
 })
 if (carry) arr.unshift(carry);
 return arr.join("").replace(/^(0+)/, "");
}

Sum Strings

Codewars kata.

Question

Given the string representations of two integers, return the string representation of the sum of those integers.

For example:

sumStrings('1','2') // => '3'

A string representation of an integer will contain no characters besides the ten numerals "0" to "9".

Solution

"use strict";
const reverseArr = s => s.split("").reverse();
function sumStrings(a, b) {
 [a, b] = [reverseArr(a), reverseArr(b)];
 let carry = 0;
 const arr = []
 const [mx, mn] = (a.length >= b.length) ? [a, b] : [b, a];
 mx.forEach((itm, idx) => {
 let sm = Number(itm) + (Number(mn[idx]) || 0) + carry;
 [sm, carry] = sm > 9 ? [sm%10, 1] : [sm, 0];
 arr.unshift(sm)
 })
 if (carry) arr.unshift(carry);
 return arr.join("").replace(/^(0+)/, "");
}

Sum Strings

Codewars kata.

It's supposed to be able to handle big integers.

Question

Given the string representations of two integers, return the string representation of the sum of those integers.

For example:

sumStrings('1','2') // => '3'

A string representation of an integer will contain no characters besides the ten numerals "0" to "9".

Solution

"use strict";
const reverseArr = s => s.split("").reverse();
function sumStrings(a, b) {
 [a, b] = [reverseArr(a), reverseArr(b)];
 let carry = 0;
 const arr = []
 const [mx, mn] = (a.length >= b.length) ? [a, b] : [b, a];
 mx.forEach((itm, idx) => {
 let sm = Number(itm) + (Number(mn[idx]) || 0) + carry;
 [sm, carry] = sm > 9 ? [sm%10, 1] : [sm, 0];
 arr.unshift(sm)
 })
 if (carry) arr.unshift(carry);
 return arr.join("").replace(/^(0+)/, "");
}