indreklasn

yarn add react react-dom && yarn start

indreklasn

function sayName(name) {
  return name
}

sayName('Indrek Lasn') // 'Indrek Lasn'

indreklasn

const add = (a, b, ...rest) => {
  console.log(rest); // [3, 4, 5]
  console.log(...rest) // 3, 4, 5
};

add(1, 2, 3, 4, 5); 

indreklasn

const add = (a, b, ...[c, d, e]) => {
  console.log(c)  // 3
  console.log(d)  // 4
  console.log(e)  // 5
  return a + b + c + d + e
};

add(1, 2, 3, 4, 5); // 15

indreklasn

const add = (a, b, ...rest, c) => {

  const allOtherNumbers = rest.reduce((number, acc) => number += acc) 
  const sum =  a + b + c + allOtherNumbers
  return sum
  
}

add(1, 2, 3, 4, 5, 6, 7, 8, 9)

indreklasn

const add = (a, b, ...rest, c) => {

	const allOtherNumbers = rest.reduce((number, acc) => number += acc) 
  
	const sum =  a + b + c + allOtherNumbers
  return sum
  
}

add(1, 2, 3, 4, 5, 6, 7, 8, 9)

indreklasn

const add = (a, b, c, ...rest) => {
  
  const allOtherNumbers = rest.reduce((number, acc) => number += acc) 
  const sum =  a + b + c + allOtherNumbers
  return sum
  
}

add(1, 2, 3, 4, 5, 6, 7, 8, 9) // 45 in this case

indreklasn

const add = (a, b, c, ...rest) => {
	
	const allOtherNumbers = rest.reduce((number, acc) => number += acc) 
	const sum =  a + b + c + allOtherNumbers
	
	return sum
  
}

add(1, 2, 3, 4, 5, 6, 7, 8, 9) // 45 in this case

indreklasn

const add = (a, b, c, ...rest) => {
 
  const allOtherNumbers = rest.reduce((number, acc) => number += acc) 
  const sum =  a + b + c + allOtherNumbers
  
  return sum
  
}

add(1, 2, 3, 4, 5, 6) // 21 in this case

indreklasn

const add = (a, b, c, ...rest) => {
  console.log(rest) // [4, 5, 6]
  return a + b + c
}

add(1, 2, 3, 4, 5, 6) // still 6