2.7 KiB
2.7 KiB
title | id | challengeType |
---|---|---|
Generate lower case ASCII alphabet | 5a23c84252665b21eecc7e7a | 5 |
Description
['a','b','c','d']
.
Instructions
Tests
tests:
- text: <code>lascii</code> should be a function.
testString: assert(typeof lascii=='function','<code>lascii</code> should be a function.');
- text: <code>lascii("a","d")</code> should return an array.
testString: assert(Array.isArray(lascii('a','d')),'<code>lascii("a","d")</code> should return an array.');
- text: "<code>lascii('a','d')</code> should return <code>[ 'a', 'b', 'c', 'd' ]</code>."
testString: assert.deepEqual(lascii("a","d"),results[0],"<code>lascii('a','d')</code> should return <code>[ 'a', 'b', 'c', 'd' ]</code>.");
- text: <code>lascii('c','i')</code> should return <code>[ 'c', 'd', 'e', 'f', 'g', 'h', 'i' ]</code>.
testString: assert.deepEqual(lascii("c","i"),results[1],"<code>lascii('c','i')</code> should return <code>[ 'c', 'd', 'e', 'f', 'g', 'h', 'i' ]</code>.");
- text: <code>lascii('m','q')</code> should return <code>[ 'm', 'n', 'o', 'p', 'q' ]</code>.
testString: assert.deepEqual(lascii("m","q"),results[2],"<code>lascii('m','q')</code> should return <code>[ 'm', 'n', 'o', 'p', 'q' ]</code>.");
- text: <code>lascii('k','n')</code> should return <code>[ 'k', 'l', 'm', 'n' ]</code>.
testString: assert.deepEqual(lascii("k","n"),results[3],"<code>lascii('k','n')</code> should return <code>[ 'k', 'l', 'm', 'n' ]</code>.");
- text: <code>lascii('t','z')</code> should return <code>[ 't', 'u', 'v', 'w', 'x', 'y', 'z' ]</code>.
testString: assert.deepEqual(lascii("t","z"),results[4],"<code>lascii('t','z')</code> should return <code>[ 't', 'u', 'v', 'w', 'x', 'y', 'z' ]</code>.");
Challenge Seed
function lascii (cFrom, cTo) {
// Good luck!
}
After Test
let results=[
[ 'a', 'b', 'c', 'd' ],
[ 'c', 'd', 'e', 'f', 'g', 'h', 'i' ],
[ 'm', 'n', 'o', 'p', 'q' ],
[ 'k', 'l', 'm', 'n' ],
[ 't', 'u', 'v', 'w', 'x', 'y', 'z' ]
]
Solution
function lascii(cFrom, cTo) {
function cRange(cFrom, cTo) {
var iStart = cFrom.charCodeAt(0);
return Array.apply(
null, Array(cTo.charCodeAt(0) - iStart + 1)
).map(function (_, i) {
return String.fromCharCode(iStart + i);
});
}
return cRange(cFrom, cTo);
}