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24 lines
1.0 KiB
24 lines
1.0 KiB
2 years ago
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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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export default function truncateString (string, maxLength) {
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// Return the empty string if maxLength is zero
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if (maxLength === 0) return ''
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// Return original string if it's already shorter than maxLength
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if (string.length <= maxLength) return string
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// 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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