Higher order functions and closures example in Javascript

First with "normal" functions:

//closures and higher order function
function salute(salutation) {
  return function(firstName) {
    return function(lastName) {
      console.log(`hi ${salutation} ${firstName} ${lastName}`)
    }
  }
}

salute('Mr.')('John')('Wick')

//output
hi Mr. John Wick

The shorter variant with arrow functions:

const saluteArrowFunction = (salutation) => (firstName) => (lastName) => console.log(`hi ${salutation} ${firstName} ${lastName}`);

saluteArrowFunction ('Mr.')('Johnny')('Cage')

//output
hi Mr. Johnny Cage

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Learn more about:

• closures on mdn
• higher order functions on Composing Software

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