Предварительно добавить аргументы функции

const partial = (fn, …partials) => (…args) => fn(…partials, …args);

const partialRight = (fn, …partials) => (…args) => fn(…args, …partials);

const greet = (greeting, name) => greeting + ' ' + name + '!';
const greetHello = partial(greet, 'Hello');
greetHello('John'); // 'Hello John!'

const greet = (greeting, name) => greeting + ' ' + name + '!';
const greetJohn = partialRight(greet, 'John');
greetJohn('Hello'); // 'Hello John!'