python一维数组求和_js 一维数组查询和数值相加

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概述

题主表意不明。

如果是一维数组的话：

var sum = function (input, uid) {

return input.filter(function (i) { return i.uid === uid; }).reduce(function (f, s) { return f.num + s.num; });

};

sum([{"uid":"5744242bc4c971005d5ff04e","num":40,"time":1464150797000},{"uid":"5744242bc4c971005d5ff04e","num":12,"time":1464251797000},{"uid":"574424e5df0eea0063adefc6","num":10,"time":1464152873000}], '5744242bc4c971005d5ff04e');

如果是要按照题目中的二维数组，对于出现了指定 uid 的子数组分别进行求和的话：

var sum = function (input, uid) {

return input.filter(function (i) { return i.some(function (s) { return s.uid === uid; }); }).map(function (i) { return i.reduce(function (f, s) { return f + s.num; }, 0); });

};

sum([[{"uid":"5744242bc4c971005d5ff04e","num":40,"time":1464150797000}],[{"uid":"5744242bc4c971005d5ff04e","num":12,"time":1464251797000}],[{"uid":"574424e5df0eea0063adefc6","num":10,"time":1464152873000}]], '5744242bc4c971005d5ff04e');