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30 lines
939 B
JavaScript
30 lines
939 B
JavaScript
/**
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* Copyright (c) HashiCorp, Inc.
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* SPDX-License-Identifier: MPL-2.0
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*/
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export default function (arr = [], attribute = 'id') {
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if (!arr.length) {
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return '';
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}
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// this assumes an already sorted array
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// if the array is sorted, we want to compare the first and last
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// item in the array - if they share a prefix, all of the items do
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const firstString = arr[0][attribute];
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const lastString = arr[arr.length - 1][attribute];
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// the longest the shared prefix could be is the length of the match
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const targetLength = firstString.length;
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let prefixLength = 0;
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// walk the two strings, and if they match at the current length,
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// increment the prefixLength and try again
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while (
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prefixLength < targetLength &&
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firstString.charAt(prefixLength) === lastString.charAt(prefixLength)
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) {
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prefixLength++;
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}
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// slice the prefix from the first item
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return firstString.substring(0, prefixLength);
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}
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