wehub-resource-sync
dde272c4b8
i18n - Build Validation / Validate i18n Builds (24) (push) Has been cancelled
CI - Node.js / Lint (24) (push) Has been cancelled
CI - Node.js / Build (24) (push) Has been cancelled
CI - Node.js / Test (24) (push) Has been cancelled
CI - Node.js / Test - Upcoming Changes (24) (push) Has been cancelled
CI - Node.js / Test - i18n (italian, 24) (push) Has been cancelled
CI - Node.js / Test - i18n (portuguese, 24) (push) Has been cancelled
CD - Docker - GHCR Images / Build and Push Images (push) Has been cancelled
86 lines
1.9 KiB
Markdown
86 lines
1.9 KiB
Markdown
---
|
|
id: 69bc6cb30c1d112a2e110a06
|
|
title: "Challenge 249: String Math"
|
|
challengeType: 28
|
|
dashedName: challenge-249
|
|
---
|
|
|
|
# --description--
|
|
|
|
Given a string with numbers and other characters, perform math on the numbers based on the count of non-digit characters between the numbers.
|
|
|
|
- If the count of characters separating two numbers is even, use addition.
|
|
- If it's odd, use subtraction.
|
|
- Consecutive digits form a single number.
|
|
- Operations are applied left to right.
|
|
- Ignore leading and trailing characters that aren't digits.
|
|
|
|
For example, given `"3ab10c8"`, return `5`. Add 3 and 10 to get 13 because there's an even number of characters between them. Then subtract 8 from 13 because there's an odd number of characters between the result and 8.
|
|
|
|
# --hints--
|
|
|
|
`doMath("3ab10c8")` should return `5`.
|
|
|
|
```js
|
|
assert.equal(doMath("3ab10c8"), 5);
|
|
```
|
|
|
|
`doMath("6MINUS4")` should return `2`.
|
|
|
|
```js
|
|
assert.equal(doMath("6MINUS4"), 2);
|
|
```
|
|
|
|
`doMath("9plus3")` should return `12`.
|
|
|
|
```js
|
|
assert.equal(doMath("9plus3"), 12);
|
|
```
|
|
|
|
`doMath("5fkwo#10i#%.<>15P=@20!#B/25")` should return `15`.
|
|
|
|
```js
|
|
assert.equal(doMath("5fkwo#10i#%.<>15P=@20!#B/25"), 15);
|
|
```
|
|
|
|
`doMath("a.67,1$lk6ldf34@#LD@]2d32d2'2l3,@l3L#@2gh35s09if=df#$t9sm49t0df3$^%[vc;:0:4mt")` should return `67`.
|
|
|
|
```js
|
|
assert.equal(doMath("a.67,1$lk6ldf34@#LD@]2d32d2'2l3,@l3L#@2gh35s09if=df#$t9sm49t0df3$^%[vc;:0:4mt"), 67);
|
|
```
|
|
|
|
# --seed--
|
|
|
|
## --seed-contents--
|
|
|
|
```js
|
|
function doMath(str) {
|
|
|
|
return str;
|
|
}
|
|
```
|
|
|
|
# --solutions--
|
|
|
|
```js
|
|
function doMath(str) {
|
|
const tokens = str.match(/(\d+)|(\D+)/g);
|
|
let result = null;
|
|
let pendingOp = null;
|
|
|
|
for (const token of tokens) {
|
|
if (/^\d+$/.test(token)) {
|
|
if (result === null) {
|
|
result = parseInt(token);
|
|
} else {
|
|
result = pendingOp === 'add' ? result + parseInt(token) : result - parseInt(token);
|
|
}
|
|
} else {
|
|
pendingOp = token.length % 2 === 0 ? 'add' : 'subtract';
|
|
}
|
|
}
|
|
|
|
return result;
|
|
}
|
|
```
|