[ksa]

getNumChars(3)

str => getNumChars(str, 3)

Оно?

const igor = {
	name: 'igor',
}
const getName = person => person.name;
const upperCase = str => str.toUpperCase();
const get3Chars = str => str.substring(0, 3);
const getNumChars = (str, n) => {
	// console.log('str', str)
	// console.log('n', n)
	return str.substring(0, n)
}
const reverse = str => str.split('').reverse().join('');
// Solution
const pipe = (...fns) => init => fns.reduce((value, f) => f(value), init);
const fn = pipe(getName, upperCase, get3Chars, reverse);
console.log(fn(igor)); // OGI
console.log(pipe(getName, upperCase, get3Chars, reverse)(igor)); // OGI
console.log(pipe(getName, upperCase, str => getNumChars(str, 3), reverse)(igor)); // Error