function toCamelCase(str){ let regex=/[^A-Za-z0-9]/ let arr=str.split('') // console.log(arr) for(let i=0;i<arr.length; i++){ if(arr[i].match(regex)){ // arr[i+1]=arr[i+1].toUpperCase() arr.splice(i, 1) arr[i]=arr[i].toUpperCase() } } return arr.join('') } console.log(toCamelCase('the_stealth_warrior')) console.log(toCamelCase('The_stealth_warrior')) console.log(toCamelCase('A-B-C'))