Why is ES6 “yield” a reserved word when called in this context?

Question

I am using node 4.1.1. When I run this code

\"use strict\";

function *generator() {
  let numbers = [1,2,3,4,5];
  numbers.map(n => yield (n + 1));
}

f         


        

Answer 1

[1,2,3,4,5].map(function*(v){yield v+1;}).reduce((accumulator, currentValue) => accumulator = [...accumulator].concat([...currentValue]))

explanation...

[1,2,3,4,5].map(function*(v){yield v+1;})

pack all values into generator resulting

(5) [Generator, Generator, Generator, Generator, Generator]

unpack into flat array

.reduce((accumulator, currentValue) => accumulator = [...accumulator].concat([...currentValue]))

(5) [2, 3, 4, 5, 6]

for normal use

[1,2,3,4,5].map(function*(v){yield v+1;}).forEach(v => console.log([...v][0]))

2

3

4

5

6

[...v][0] is a bit ugly but it is works.