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Commitc9f1caf

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Add a recursive version of the Longest Common Substring.
1 parentbcd1cc1 commitc9f1caf

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4 files changed

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4 files changed

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‎src/algorithms/string/longest-common-substring/__test__/longestCommonSubstring.test.js

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@@ -7,6 +7,8 @@ describe('longestCommonSubstring', () => {
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expect(longestCommonSubstring('','ABC')).toBe('');
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expect(longestCommonSubstring('ABABC','BABCA')).toBe('BABC');
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expect(longestCommonSubstring('BABCA','ABCBA')).toBe('ABC');
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expect(longestCommonSubstring('sea','eat')).toBe('ea');
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expect(longestCommonSubstring('algorithms','rithm')).toBe('rithm');
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expect(longestCommonSubstring(
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'Algorithms and data structures implemented in JavaScript',
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'Here you may find Algorithms and data structures that are implemented in JavaScript',
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importlongestCommonSubstringfrom'../longestCommonSubstringRecursive';
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describe('longestCommonSubstringRecursive',()=>{
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it('should find longest common substring between two strings',()=>{
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expect(longestCommonSubstring('','')).toBe('');
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expect(longestCommonSubstring('ABC','')).toBe('');
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expect(longestCommonSubstring('','ABC')).toBe('');
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expect(longestCommonSubstring('ABABC','BABCA')).toBe('BABC');
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expect(longestCommonSubstring('BABCA','ABCBA')).toBe('ABCA');
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expect(longestCommonSubstring('sea','eat')).toBe('ea');
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expect(longestCommonSubstring('algorithms','rithm')).toBe('rithm');
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expect(longestCommonSubstring(
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'Algorithms and data structures implemented in JavaScript',
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'Here you may find Algorithms and data structures that are implemented in JavaScript',
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)).toBe('Algorithms and data structures implemented in JavaScript');
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});
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});

‎src/algorithms/string/longest-common-substring/longestCommonSubstring.js

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/**
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* Longest Common Substring (LCS) (Dynamic Programming Approach).
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*
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*@param {string} string1
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*@param {string} string2
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*@return {string}
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/* eslint-disable no-param-reassign */
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/**
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* Longest Common Substring (LCS) (Recursive Approach).
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*
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*@param {string} string1
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*@param {string} string2
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*@return {number}
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*/
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exportdefaultfunctionlongestCommonSubstringRecursive(string1,string2){
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/**
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*
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*@param {string} s1
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*@param {string} s2
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*@return {string} - returns the LCS (Longest Common Substring)
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*/
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constlcs=(s1,s2,memo={})=>{
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if(!s1||!s2)return'';
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if(memo[`${s1}:${s2}`])returnmemo[`${s1}:${s2}`];
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if(s1[0]===s2[0]){
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returns1[0]+lcs(s1.substring(1),s2.substring(1),memo);
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}
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constnextLcs1=lcs(s1.substring(1),s2,memo);
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constnextLcs2=lcs(s1,s2.substring(1),memo);
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constnextLongest=nextLcs1.length>=nextLcs2.length ?nextLcs1 :nextLcs2;
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memo[`${s1}:${s2}`]=nextLongest;
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returnnextLongest;
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};
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returnlcs(string1,string2);
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}

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