26 lines
1.0 KiB
JavaScript
26 lines
1.0 KiB
JavaScript
"use strict";
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/**
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* Truncates a string to the given number of chars (maxLength) by inserting '...' in the middle of that string.
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* Partially taken from https://stackoverflow.com/a/5723274/3192470.
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*
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* @param {string} string - string to be truncated
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* @param {number} maxLength - maximum size of the resulting string
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* @returns {string}
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*/
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const separator = '...';
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function truncateString(string, maxLength) {
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// Return the empty string if maxLength is zero
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if (maxLength === 0) return ''; // Return original string if it's already shorter than maxLength
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if (string.length <= maxLength) return string; // Return truncated substring appended of the ellipsis char if string can't be meaningfully truncated
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if (maxLength <= separator.length + 1) return `${string.slice(0, maxLength - 1)}…`;
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const charsToShow = maxLength - separator.length;
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const frontChars = Math.ceil(charsToShow / 2);
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const backChars = Math.floor(charsToShow / 2);
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return string.slice(0, frontChars) + separator + string.slice(-backChars);
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}
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module.exports = truncateString; |