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Commit6c718c0

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add: countSubstrings function implementation (#1091)
1 parent61c9e8b commit6c718c0

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2 files changed

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‎String/CountSubstrings.js

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/**
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*@function countSubstrings
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*@description Given a string of words or phrases, count the occurrences of a substring
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*@param {String} str - The input string
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*@param {String} substring - The substring
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*@return {Number} - The number of substring occurrences
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*@example countSubstrings("This is a string", "is") => 2
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*@example countSubstrings("Hello", "e") => 1
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*/
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constcountSubstrings=(str,substring)=>{
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if(typeofstr!=='string'||typeofsubstring!=='string'){
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thrownewTypeError('Argument should be string')
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}
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if(substring.length===0)returnstr.length+1
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letcount=0
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letposition=str.indexOf(substring)
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while(position>-1){
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count++
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position=str.indexOf(substring,position+1)
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}
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returncount
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}
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export{countSubstrings}

‎String/test/CountSubstrings.test.js

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import{countSubstrings}from'../CountSubstrings'
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describe('CountSubstrings',()=>{
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it('count multiple occurrences of substring in a string',()=>{
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conststr='This is a string'
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constsubstring='is'
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constcount=countSubstrings(str,substring)
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expect(count).toBe(2)
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})
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it('should return 0 when input substring has no occurrences',()=>{
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conststr='Jurassic Park'
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constsubstring='World'
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constcount=countSubstrings(str,substring)
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expect(count).toBe(0)
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})
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it('should return 1 when input substring is of length 1 that is equal to string',()=>{
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conststr='s'
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constsubstring='s'
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constcount=countSubstrings(str,substring)
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expect(count).toBe(1)
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})
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it('should return the correct result when input string contains spaces',()=>{
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conststr='ab cd ef ghi'
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constsubstring=' '
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constcount=countSubstrings(str,substring)
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expect(count).toBe(4)
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})
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it('should return the correct result when input substring contains number or special characters',()=>{
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conststr='abc1@2def1@2'
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constsubstring='1@2'
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constcount=countSubstrings(str,substring)
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expect(count).toBe(2)
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})
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it('should return string.length + 1 when the input substring is an empty string',()=>{
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conststr='empty'
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constsubstring=''
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constcount=countSubstrings(str,substring)
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expect(count).toBe(6)
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})
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it('should return correct result when input is overlapping substring',()=>{
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conststr='aaa'
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constsubstring='aa'
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constcount=countSubstrings(str,substring)
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expect(count).toBe(2)
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})
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})

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