Commit 0361fe5

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Fix knuthMorrisPratt for empty word request (trekhleb#101)

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src/algorithms/string/knuth-morris-pratt
- __test__
  - knuthMorrisPratt.test.js
- knuthMorrisPratt.js

-2

lines changed

Lines changed: 2 additions & 2 deletions

Original file line number	Diff line number	Diff line change
`@@ -2,8 +2,8 @@ import knuthMorrisPratt from '../knuthMorrisPratt';`
`2`	`2`
`3`	`3`	`describe('knuthMorrisPratt', () => {`
`4`	`4`	`it('should find word position in given text', () => {`
`5`		`- expect(knuthMorrisPratt('', '')).toBe(-1);`
`6`		`- expect(knuthMorrisPratt('a', '')).toBe(-1);`
	`5`	`+ expect(knuthMorrisPratt('', '')).toBe(0);`
	`6`	`+ expect(knuthMorrisPratt('a', '')).toBe(0);`
`7`	`7`	`expect(knuthMorrisPratt('a', 'a')).toBe(0);`
`8`	`8`	`expect(knuthMorrisPratt('abcbcglx', 'abca')).toBe(-1);`
`9`	`9`	`expect(knuthMorrisPratt('abcbcglx', 'bcgl')).toBe(3);`

Lines changed: 4 additions & 0 deletions

Original file line number	Diff line number	Diff line change
`@@ -30,6 +30,10 @@ function buildPatternTable(word) {`
`30`	`30`	`* @return {number}`
`31`	`31`	`*/`
`32`	`32`	`export default function knuthMorrisPratt(text, word) {`
	`33`	`+ if (word.length === 0) {`
	`34`	`+ return 0;`
	`35`	`+ }`
	`36`	`+`
`33`	`37`	`let textIndex = 0;`
`34`	`38`	`let wordIndex = 0;`
`35`	`39`

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