52 lines
1.2 KiB
Markdown
52 lines
1.2 KiB
Markdown
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title: Straddling checkerboard
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---
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# Straddling checkerboard
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---
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## Solutions
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<details><summary>Solution 1 (Click to Show/Hide)</summary>
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```javascript
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function straddle(message, alphabet) {
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var prefixes = new Array("", alphabet[0].indexOf(" "), alphabet[0].lastIndexOf(" "))
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var out = ""
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message = message.toUpperCase()
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message = message.replace(/([0-9])/g, "/$1") // dumb way to escape numbers
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for (var i = 0; i < message.length; i++) {
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var chr = message[i]
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if (chr == " ") continue
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for (var j = 0; j < 3; j++) {
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var k = alphabet[j].indexOf(chr)
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if (k < 0) continue
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out += prefixes[j].toString() + k
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}
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if (chr == "/") out += message[++i]
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}
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return out
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}
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function unstraddle(message, alphabet) {
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var prefixes = new Array("", alphabet[0].indexOf(" "), alphabet[0].lastIndexOf(" "))
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var out = ""
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var n, o
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for (var i = 0; i < message.length; i++) {
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n = message[i] * 1
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switch (n) {
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case prefixes[1]:
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o = alphabet[1][message[++i]];
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break
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case prefixes[2]:
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o = alphabet[2][message[++i]];
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break
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default:
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o = alphabet[0][n]
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}
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o == "/" ? out += message[++i] : out += o
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}
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return out
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}
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```
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</details>
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