92 lines
2.7 KiB
Markdown
92 lines
2.7 KiB
Markdown
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---
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title: Generate lower case ASCII alphabet
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id: 5a23c84252665b21eecc7e7a
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challengeType: 5
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---
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## Description
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<section id='description'>
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Write a function to generate an array of lower case ASCII characters, for a given range. For example: for range 1 to 4 the function should return <code>['a','b','c','d']</code>.
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</section>
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## Instructions
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<section id='instructions'>
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</section>
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## Tests
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<section id='tests'>
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```yml
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tests:
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- text: '''<code>lascii</code> should be a function.'''
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testString: 'assert(typeof lascii==''function'',''<code>lascii</code> should be a function.'');'
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- text: '''<code>lascii("a","d")</code> should return an array.'''
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testString: 'assert(Array.isArray(lascii(''a'',''d'')),''<code>lascii("a","d")</code> should return an array.'');'
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- text: '"<code>lascii(''a'',''d'')</code> should return <code>[ ''a'', ''b'', ''c'', ''d'' ]</code>."'
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testString: 'assert.deepEqual(lascii("a","d"),results[0],"<code>lascii(''a'',''d'')</code> should return <code>[ ''a'', ''b'', ''c'', ''d'' ]</code>.");'
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- text: '"<code>lascii(''c'',''i'')</code> should return <code>[ ''c'', ''d'', ''e'', ''f'', ''g'', ''h'', ''i'' ]</code>."'
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testString: 'assert.deepEqual(lascii("c","i"),results[1],"<code>lascii(''c'',''i'')</code> should return <code>[ ''c'', ''d'', ''e'', ''f'', ''g'', ''h'', ''i'' ]</code>.");'
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- text: '"<code>lascii(''m'',''q'')</code> should return <code>[ ''m'', ''n'', ''o'', ''p'', ''q'' ]</code>."'
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testString: 'assert.deepEqual(lascii("m","q"),results[2],"<code>lascii(''m'',''q'')</code> should return <code>[ ''m'', ''n'', ''o'', ''p'', ''q'' ]</code>.");'
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- text: '"<code>lascii(''k'',''n'')</code> should return <code>[ ''k'', ''l'', ''m'', ''n'' ]</code>.")'
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testString: 'assert.deepEqual(lascii("k","n"),results[3],"<code>lascii(''k'',''n'')</code> should return <code>[ ''k'', ''l'', ''m'', ''n'' ]</code>.");'
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- text: '"<code>lascii(''t'',''z'')</code> should return <code>[ ''t'', ''u'', ''v'', ''w'', ''x'', ''y'', ''z'' ]</code>."'
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testString: 'assert.deepEqual(lascii("t","z"),results[4],"<code>lascii(''t'',''z'')</code> should return <code>[ ''t'', ''u'', ''v'', ''w'', ''x'', ''y'', ''z'' ]</code>.");'
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```
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</section>
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## Challenge Seed
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<section id='challengeSeed'>
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<div id='js-seed'>
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```js
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function lascii (cFrom, cTo) {
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// Good luck!
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}
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```
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</div>
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### After Test
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<div id='js-teardown'>
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```js
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console.info('after the test');
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```
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</div>
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</section>
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## Solution
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<section id='solution'>
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```js
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function lascii(cFrom, cTo) {
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function cRange(cFrom, cTo) {
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var iStart = cFrom.charCodeAt(0);
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return Array.apply(
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null, Array(cTo.charCodeAt(0) - iStart + 1)
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).map(function (_, i) {
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return String.fromCharCode(iStart + i);
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});
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}
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return cRange(cFrom, cTo);
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}
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```
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</section>
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