40 lines
1.1 KiB
JavaScript
40 lines
1.1 KiB
JavaScript
import countImages from './count-images';
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import countWords from './count-words';
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export function estimatedReadingTimeInMinutes({wordCount, imageCount}) {
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const wordsPerMinute = 275;
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const wordsPerSecond = wordsPerMinute / 60;
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let readingTimeSeconds = wordCount / wordsPerSecond;
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// add 12 seconds for the first image, 11 for the second, etc. limiting at 3
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for (var i = 12; i > 12 - imageCount; i -= 1) {
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readingTimeSeconds += Math.max(i, 3);
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}
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let readingTimeMinutes = Math.round(readingTimeSeconds / 60);
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return readingTimeMinutes;
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}
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/**
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* Reading minutes method
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*
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* @param {string} html - HTML that we want to calculate reading time for
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* @param {string} additionalImages - additional images that need to be taken into account outside HTML
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* @returns {number} estimated reading in minutes
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*/
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export default function readingMinutes(html, additionalImages) {
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if (!html) {
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return '';
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}
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let imageCount = countImages(html);
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let wordCount = countWords(html);
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if (additionalImages) {
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imageCount += additionalImages;
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}
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return estimatedReadingTimeInMinutes({wordCount, imageCount});
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}
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