In this article, given a string and the task is to convert it into camelCase using JavaScript. In this case, the first character of the string is converted into lowercase, and other characters after space will be converted into uppercase characters.
Approaches to convert string to camel case:
- Using the JavaScript str.replace() method with Regular Expression
- Using JavaScript reduce() and split() method
Approach 1: Using the JavaScript str.replace() method
Use str.replace() method to replace the first character of the string in lower case and other characters after space will be in upper case. The toUpperCase() and toLowerCase() methods are used to convert the string character into upper case and lower case respectively.
Example 1: This example uses RegExp, toLowerCase() and toUpperCase() methods to convert a string into camelCase.Â
Javascript
// Input string with spaceslet str = 'Click the button to convert to camelCase';Â
// Function to convert into camel Casefunction camelCase(str) {    // Using replace method with regEx    return str.replace(/(?:^\w|[A-Z]|\b\w)/g, function (word, index) {        return index == 0 ? word.toLowerCase() : word.toUpperCase();    }).replace(/\s+/g, '');}Â
// To display outputfunction gfg_Run() {Â Â Â Â console.log(camelCase(str));}// Function callgfg_Run() |
clickTheButtonToConvertToCamelCase
Example 2: This example uses replace(), toLowerCase(), and toUpperCase() methods to convert a string into camelCase.Â
Javascript
let str = 'Click the button to convert to camelCase';Â
function camelCase(str) {    return str        .replace(/\s(.)/g, function (a) {            return a.toUpperCase();        })        .replace(/\s/g, '')        .replace(/^(.)/, function (b) {            return b.toLowerCase();        });}Â
function gfg_Run() {Â Â Â Â console.log(camelCase(str));}gfg_Run() |
clickTheButtonToConvertToCamelCase
Approach 2: Using JavaScript reduce() and split() method
Use reduce() method to iterate over the character of the string and convert it into camel case. The toUpperCase() and toLowerCase() methods are used to convert the string character into upper case and lower case respectively.
Example 1: This example uses reduce, toLowerCase(), and toUpperCase() methods to convert a string into camelCase.Â
Javascript
let str = 'Click the button to convert to camelCase';Â
function camelCase(str) {    // converting all characters to lowercase    let ans = str.toLowerCase();Â
    // Returning string to camelcase    return ans.split(" ").reduce((s, c) => s        + (c.charAt(0).toUpperCase() + c.slice(1)));Â
}Â
function gfg_Run() {Â Â Â Â console.log(camelCase(str));}gfg_Run() |
clickTheButtonToConvertToCamelcase
