Especially for reselect (https://github.com/reactjs/reselect). Reducing of number of arguments in selector with help of spread operator.

example.js

var xSelector = () => 11;
var ySelector = () => 22;
var zSelector = () => ({ z1: 31, z2: 32 });

var mainSelector = createSelector(
    xSelector, ySelector, zSelector,
    (...all) => {
        let [x, y, { z1, z2 }] = all;
        return {
            x,
            y,
            z1,
            z2
        };
    }
);

// test result
console.log(mainSelector()); // => { x: 11, y: 22, z1: 31, z2: 32 }


// fake createSelector
function createSelector(...args) {
    return function() {
        let factory = args.pop();
        return factory.apply(null, args.map(selector => selector()));
    };
}