let normalFn = function(a) {
    a + 10
};
let lambdaFn = lambda ?0 + 10;
let spreadFn = function(...a) {
    a.reduce(lambda ?0 + ?1, 0)
};
let fnArr = {spread: spreadFn, other: [normalFn, lambdaFn]};
fnArr.spread(fnArr.other[0](10), fnArr.other[1](20), function(){30}())