Basic explanation of currying.

curry.js

// create a curried function
const introSelf = lastName => firstName => console.log(`My name is ${firstName} ${lastName}`)

// use curried function
introSelf("Youdiowei")("Eteimorde")
// Output: My name is Eteimorde Youdiowei

// partially apply the curried function to create a new one
const introDoe = introSelf("Doe")

// use partial function

introDoe("John")
// Output: My name is John Doe

introDoe("John")
// Output: My name is Jane Doe