curry1.js

let sentence = ''

function say () {

  if ( !arguments[0] ) {
    let s = sentence
    sentence = ''
    return s
  } else {      
    sentence += arguments[0] + ' '
    // Note: This is not a recursion
    return say
  }

}

console.log( say('Foo')('bar')() ) // => "Foo bar "
console.log( say('Hi')('my')('name')('is')('Foo')() ) // "Hi my name is Foo "