27 lines
760 B
JavaScript
27 lines
760 B
JavaScript
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import _ from 'lodash';
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class ChallengeTitles {
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constructor() {
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this.knownTitles = [];
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}
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check(title) {
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if (typeof title !== 'string') {
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throw new Error(`Expected a valid string for ${title}, got ${typeof title}`);
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} else if (title.length === 0) {
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throw new Error(`Expected a title length greater than 0`);
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}
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const titleToCheck = title.toLowerCase().replace(/\s+/g, '');
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const titleIndex = _.findIndex(this.knownTitles, existing => titleToCheck === existing);
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if (titleIndex !== -1) {
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throw new Error(`
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All challenges must have a unique title.
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The title ${title} is already assigned
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`);
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}
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this.knownTitles = [ ...this.knownTitles, titleToCheck ];
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}
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}
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export default ChallengeTitles;
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