js camelcase

1const sentence = 'The quick brown fox jumps over the lazy dog.';
2console.log(sentence.toUpperCase());
3// expected output: "THE QUICK BROWN FOX JUMPS OVER THE LAZY DOG."

1String.prototype.toCamelCase = function () {
2	let STR = this.toLowerCase()
3		.trim()
4		.split(/[ -_]/g)
5		.map(word => word.replace(word[0], word[0].toString().toUpperCase()))
6		.join('');
7	return STR.replace(STR[0], STR[0].toLowerCase());
8};

1function toCamelCase(str) {
2    return str
3        .replace(/\s(.)/g, function($1) { return $1.toUpperCase(); })
4        .replace(/\s/g, '')
5        .replace(/^(.)/, function($1) { return $1.toLowerCase(); });
6}