18 lines
622 B
JavaScript
18 lines
622 B
JavaScript
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import { helper } from '@ember/component/helper';
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/**
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* Conditionally maps classInfos (classes) to a string ready for typical DOM
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* usage (i.e. space delimited)
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*
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* @typedef {([string, boolean] | [string])} classInfo
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* @param {(classInfo | string)[]} entries - An array of 'entry-like' arrays of `classInfo`s to map
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*/
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const classMap = entries => {
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const str = entries
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.filter(entry => (typeof entry === 'string' ? true : entry[entry.length - 1]))
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.map(entry => (typeof entry === 'string' ? entry : entry[0]))
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.join(' ');
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return str.length > 0 ? str : undefined;
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};
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export default helper(classMap);
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