JavaScript - Convert Comma Separated String To Array Last Updated : 26 Nov, 2024 Comments Improve Suggest changes Like Article Like Report Here are the various methods to convert comma-separated string to array using JavaScript.1. Using the split() Method (Most Common)The split() method is the simplest and most commonly used way to convert a comma-separated string into an array. It splits a string into an array based on a specified character, such as a comma. JavaScript const s = "apple,banana,cherry"; const a = s.split(","); console.log(a); Output[ 'apple', 'banana', 'cherry' ] s.split(",") splits the string s wherever a comma appears.Returns an array of substrings.2. Using Array.prototype.reduce() MethodYou can use the reduce() method to build an array from a string for more control over the conversion process. JavaScript const s = "apple,banana,cherry"; const a = s.split("").reduce((obj, char) => { if (char === ",") { obj.push(""); } else { obj[obj.length - 1] += char; } return obj; }, [""]); console.log(a); Output[ 'apple', 'banana', 'cherry' ] The string is split into individual characters using s.split("").The reduce() function builds an array by concatenating characters until a comma is encountered.3. Using Loops and slice() MethodYou can manually process the string using loops and the slice() method to extract substrings. JavaScript const s = "apple,banana,cherry"; const a = []; let start = 0; for (let i = 0; i < s.length; i++) { if (s[i] === ",") { a.push(s.slice(start, i)); start = i + 1; } } a.push(s.slice(start)); console.log(a); Output[ 'apple', 'banana', 'cherry' ] The loop iterates through the string, finding commas.The slice() method extracts substrings between indexes and adds them to the array.4. Using Regular Expressions (RegExp) and match() MethodThe match() method, combined with a regular expression, is useful if the input string contains irregular spacing or special characters around the commas. JavaScript const s = "apple , banana , cherry "; const a = s.match(/[^,\s]+/g); console.log(a); Output[ 'apple', 'banana', 'cherry' ] [^,\s]+ matches sequences of characters that are not commas or spaces.The g flag ensures the regex matches all occurrences in the string.Handling Edge CasesWhen working with user-generated or inconsistent data, consider the following casesCase 1: Trailing CommasThe filter() method removes empty strings caused by trailing commas. JavaScript const s = "apple,banana,cherry,"; const a = s.split(",").filter(item => item !== ""); console.log(a); Output[ 'apple', 'banana', 'cherry' ] Case 2: Extra SpacesThe map() method trims unnecessary spaces from each substring. JavaScript const s = " apple , banana , cherry "; const a = s.split(",").map(item => item.trim()); console.log(a); Output[ 'apple', 'banana', 'cherry' ] Comparison of MethodsApproachUse CaseComplexitysplit()Ideal for clean, comma-separated strings without extra processing.O(n)reduce()Great for custom parsing logic or transformations.O(n)slice() + LoopsOffers low-level control but can be complicated.O(n)Regex + match()Best for handling irregular input with spaces or special characters.O(n)Edge Case HandlingNecessary for real-world scenarios like trailing commas and extra spaces.Depends on the case Comment More infoAdvertise with us Next Article JavaScript - Convert Comma Separated String To Array sayantanm19 Follow Improve Article Tags : JavaScript Web Technologies javascript-string javascript-array JavaScript-DSA +1 More Similar Reads Non-linear Components In electrical circuits, Non-linear Components are electronic devices that need an external power source to operate actively. 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