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---
id: 5a23c84252665b21eecc8029
title: Straddling checkerboard
challengeType: 5
forumTopicId: 302325
dashedName: straddling-checkerboard
---
# --description--
Implement functions to encrypt and decrypt a message using the [straddling checkerboard](https://en.wikipedia.org/wiki/Straddling_checkerboard) method. The functions will take a string and an array as parameters. The array has 3 strings representing the 3 rows of the checkerboard. The output will be a series of decimal digits. Numbers should be encrypted by inserting the escape character before each digit, then including the digit unencrypted. This should be reversed for decryption.
# --hints--
`straddle` should be a function.
```js
assert(typeof straddle == 'function');
```
`straddle("One night-it was on the twentieth of March, 1888-I was returning.",["ESTONIA R", "BCDFGHJKLM", "PQUVWXYZ./"])` should return a string.
```js
assert(
typeof straddle(
'One night-it was on the twentieth of March, 1888-I was returning.',
['ESTONIA R', 'BCDFGHJKLM', 'PQUVWXYZ./']
) == 'string'
);
```
`straddle("One night-it was on the twentieth of March, 1888-I was returning.",["ESTONIA R", "BCDFGHJKLM", "PQUVWXYZ./"])` should return `"34045747525284613427502840425027537379697175891898898898584619028294547488"`.
```js
assert.equal(
straddle(
'One night-it was on the twentieth of March, 1888-I was returning.',
['ESTONIA R', 'BCDFGHJKLM', 'PQUVWXYZ./']
),
'34045747525284613427502840425027537379697175891898898898584619028294547488'
);
```
`straddle("One night-it was on the twentieth of March, 1888-I was returning",["HOL MES RT", "ABCDFGIJKN", "PQUVWXYZ./"])` should return `"139539363509369743061399059745399365901344308320791798798798367430685972839363935"`.
```js
assert.equal(
straddle('One night-it was on the twentieth of March, 1888-I was returning', [
'HOL MES RT',
'ABCDFGIJKN',
'PQUVWXYZ./'
]),
'139539363509369743061399059745399365901344308320791798798798367430685972839363935'
);
```
`straddle("Thecheckerboardcakerecipespecifies3largeeggsand2.25cupsofflour.",["ET AON RIS", "BCDFGHJKLM", "PQ/UVWXYZ."])` should return `"125021250212707204372221327070218600960021823809623283724002424935226226962262521636094232328463769"`.
```js
assert.equal(
straddle('Thecheckerboardcakerecipespecifies3largeeggsand2.25cupsofflour.', [
'ET AON RIS',
'BCDFGHJKLM',
'PQ/UVWXYZ.'
]),
'125021250212707204372221327070218600960021823809623283724002424935226226962262521636094232328463769'
);
```
`unstraddle` should be a function.
```js
assert(typeof unstraddle == 'function');
```
`unstraddle("34045747525284613427502840425027537379697175891898898898584619028294547488",["ESTONIA R", "BCDFGHJKLM", "PQUVWXYZ./"])` should return a string.
```js
assert(
typeof unstraddle(
'34045747525284613427502840425027537379697175891898898898584619028294547488',
['ESTONIA R', 'BCDFGHJKLM', 'PQUVWXYZ./']
) == 'string'
);
```
`unstraddle("34045747525284613427502840425027537379697175891898898898584619028294547488",["ESTONIA R", "BCDFGHJKLM", "PQUVWXYZ./"])` should return `"ONENIGHTITWASONTHETWENTIETHOFMARCH1888IWASRETURNING."`.
```js
assert.equal(
unstraddle(
'34045747525284613427502840425027537379697175891898898898584619028294547488',
['ESTONIA R', 'BCDFGHJKLM', 'PQUVWXYZ./']
),
'ONENIGHTITWASONTHETWENTIETHOFMARCH1888IWASRETURNING.'
);
```
`unstraddle("139539363509369743061399059745399365901344308320791798798798367430685972839363935",["HOL MES RT", "ABCDFGIJKN", "PQUVWXYZ./"])` should return `"ONENIGHTITWASONTHETWENTIETHOFMARCH1888IWASRETURNING"`.
```js
assert.equal(
unstraddle(
'139539363509369743061399059745399365901344308320791798798798367430685972839363935',
['HOL MES RT', 'ABCDFGIJKN', 'PQUVWXYZ./']
),
'ONENIGHTITWASONTHETWENTIETHOFMARCH1888IWASRETURNING'
);
```
`unstraddle("125021250212707204372221327070218600960021823809623283724002424935226226962262521636094232328463769",["ET AON RIS", "BCDFGHJKLM", "PQ/UVWXYZ."])` should return `"THECHECKERBOARDCAKERECIPESPECIFIES3LARGEEGGSAND2.25CUPSOFFLOUR."`.
```js
assert.equal(
unstraddle(
'125021250212707204372221327070218600960021823809623283724002424935226226962262521636094232328463769',
['ET AON RIS', 'BCDFGHJKLM', 'PQ/UVWXYZ.']
),
'THECHECKERBOARDCAKERECIPESPECIFIES3LARGEEGGSAND2.25CUPSOFFLOUR.'
);
```
# --seed--
## --seed-contents--
```js
function straddle(message, alphabet) {
}
function unstraddle(message, alphabet) {
}
```
# --solutions--
```js
function straddle(message, alphabet) {
var prefixes = new Array(
'',
alphabet[0].indexOf(' '),
alphabet[0].lastIndexOf(' ')
);
var out = '';
message = message.toUpperCase();
message = message.replace(/([0-9])/g, '/$1'); // dumb way to escape numbers
for (var i = 0; i < message.length; i++) {
var chr = message[i];
if (chr == ' ') continue;
for (var j = 0; j < 3; j++) {
var k = alphabet[j].indexOf(chr);
if (k < 0) continue;
out += prefixes[j].toString() + k;
}
if (chr == '/') out += message[++i];
}
return out;
}
function unstraddle(message, alphabet) {
var prefixes = new Array(
'',
alphabet[0].indexOf(' '),
alphabet[0].lastIndexOf(' ')
);
var out = '';
var n, o;
for (var i = 0; i < message.length; i++) {
n = message[i] * 1;
switch (n) {
case prefixes[1]:
o = alphabet[1][message[++i]];
break;
case prefixes[2]:
o = alphabet[2][message[++i]];
break;
default:
o = alphabet[0][n];
}
o == '/' ? (out += message[++i]) : (out += o);
}
return out;
}
```