javascript coroutine wrap

wrap.js

// based on coroutine.wrap in lua (https://www.lua.org/pil/9.3.html)
function wrap(generator) {
    let g = null
    return function(...args) {
        if(!g)
            g = generator(...args)
        return g.next(...args).value
    }
}

// usage
var f = wrap(function* (name) {
    console.log('hello', name);
    let other = yield name.length
    console.log('hello', name, other);
})

f('ramsey')
// prints: hello ramsey
// returns: 6
f('nasser')
// prints: hello ramsey nasser
// returns: undefined
f('nasser')
// returns: undefined