1379180ecd
* Evaluations and Linting now runs on separate web-workers for a much faster and responsive coding experience on Appsmith. * Removed worker-loader webpack plugin.
54 lines
1.6 KiB
TypeScript
54 lines
1.6 KiB
TypeScript
// Finds the first index which is a duplicate value
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// Returns -1 if there are no duplicates
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// Returns the index of the first duplicate entry it finds
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// Note: This "can" fail if the object entries don't have their properties in the
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// same order.
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export const findDuplicateIndex = (arr: Array<unknown>) => {
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const _uniqSet = new Set();
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let currSetSize = 0;
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for (let i = 0; i < arr.length; i++) {
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// JSON.stringify because value can be objects
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_uniqSet.add(JSON.stringify(arr[i]));
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if (_uniqSet.size > currSetSize) currSetSize = _uniqSet.size;
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else return i;
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}
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return -1;
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};
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/** Function that count occurrences of a substring in a string;
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* @param {String} string The string
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* @param {String} subString The sub string to search for
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* @param {Boolean} [allowOverlapping] Optional. (Default:false)
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* @param {Number | null} [maxLimit] Optional. (Default:null)
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*/
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export const countOccurrences = (
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string: string,
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subString: string,
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allowOverlapping = false,
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maxLimit: number | null = null,
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): number => {
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string += "";
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subString += "";
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if (subString.length <= 0) return string.length + 1;
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let n = 0, // count of occurrences
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pos = 0; // current position of the pointer
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const step = allowOverlapping ? 1 : subString.length;
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while (true) {
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pos = string.indexOf(subString, pos);
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if (pos >= 0) {
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++n;
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/**
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* If you are only interested in knowing
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* whether occurances count exceeds maxLimit,
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* then break the loop.
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*/
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if (maxLimit && n > maxLimit) break;
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pos += step;
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} else break;
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}
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return n;
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};
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