Object.values与Object.entries的兼容处理

const reduce = Function.bind.call(Function.call, Array.prototype.reduce);
const isEnumerable = Function.bind.call(Function.call, Object.prototype.propertyIsEnumerable);
const concat = Function.bind.call(Function.call, Array.prototype.concat);
const keys = Reflect.ownKeys;


if (!Object.values) {
    Object.values = function values(O) {
        return reduce(keys(O), (v, k) = >concat(v, typeof k === 'string' && isEnumerable(O, k) ? [O[k]] : []), []);
    };
}

if (!Object.entries) {
    Object.entries = function entries(O) {
        return reduce(keys(O), (e, k) = >concat(e, typeof k === 'string' && isEnumerable(O, k) ? [[k, O[k]]] : []), []);
    };
}
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