李鹏#32
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freewind wants to merge 4 commits into
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added 2 commits
July 29, 2016 10:17
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已占作 |
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我要占坑 |
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占坑 |
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板凳已占 |
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火钳留名 |
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占坑 |
| return _(collection) | ||
| .filter(x => x%2==0) | ||
| .map(x => x - 1) | ||
| .map(x => "a".charCodeAt(0) + x) |
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占满也要看 |
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| //在这里写入代码 | ||
| function hybrid_operation(collection) { | ||
| return _(collection).map(x => x*3+2).sum(); |
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这里为啥不写成_.chain(collection).map(x => x*3+2).sum().value();?
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一般——chian()链加value(),有sum(),mean()等结果是数字的不用加
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_(collection).map(x => x*3+2).sum()和_chian(collection).map(x => x*3+2).sum().value()是等价的
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搬着小椅子占 |
| //在这里写入代码 | ||
| function average_to_letter(collection) { | ||
| let sum = _.sum(collection); | ||
| let average = Math.ceil(sum/collection.length); |
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let average = .ceil(.mean(collection));
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let total = _.mean(collection);
let dev = _.ceil(total);
Author
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更好的做法是先chain，再调用mean和ceil，感谢同学们指出：
_.chain(collection).sum().ceil().value()
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占座 |
| function average_uneven(collection) { | ||
| let odds = _.filter(collection, x=>x%2===1); | ||
| let sum = _.sum(odds); | ||
| return sum/odds.length; |
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这三行可以直接简写为return _.chain(collection).filter(x =>x%2===1).mean().value();
added 2 commits
July 29, 2016 14:43
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implemented 7 specs