javascript - 如何制作 `where not` 大小写？

Question

我需要 where 但 not 大小写。例如，我想找到没有名字“莎士比亚”的戏剧:

_.where(listOfPlays, {author: !"Shakespeare", year: 1611});
                              ^^^^^^^^^^^^^
                            NOT Shakespeare

如何使用 underscore 来实现？

Answer 1

_.filter(listOfPlays, function(play) {
    return play.author !== 'Shakespeare' && play.year === 1611;
});

http://underscorejs.org/#filter

where 只不过是 filter 的一个方便的包装器:

// Convenience version of a common use case of `filter`: selecting only objects
// containing specific `key:value` pairs.
_.where = function(obj, attrs) {
    return _.filter(obj, _.matches(attrs));
};

https://github.com/jashkenas/underscore/blob/a6c404170d37aae4f499efb185d610e098d92e47/underscore.js#L249