$ npm install --save camelcase

js
const camelCase = require('camelcase');

camelCase('foo-bar');
//=> 'fooBar'

camelCase('foo_bar');
//=> 'fooBar'

camelCase('Foo-Bar');
//=> 'fooBar'

camelCase('--foo.bar');
//=> 'fooBar'

camelCase('__foo__bar__');
//=> 'fooBar'

camelCase('foo bar');
//=> 'fooBar'

console.log(process.argv[3]);
//=> '--foo-bar'
camelCase(process.argv[3]);
//=> 'fooBar'

camelCase('foo', 'bar');
//=> 'fooBar'

camelCase('__foo__', '--bar');
//=> 'fooBar'