如何使用下划線 javascript 過濾數組數組

Question

我有一個 object 數組，如下所示：

[{name:'Initiative 1', actionList:[{name:'action 1', productionLine:'436767'}]}, {name:'Initiative 2', actionList:[{name:'action 2', productionLine:'892128'}]}]

我想根據 actionList 元素的某些屬性過濾結果，例如基於 productionLine 值。

這是我的代碼，它沒有按預期工作，我得到一個空結果。

initiatives.forEach(function(initiative) {
     var newArr = _.filter(initiative.actionList, function({
         return o.productionLine == selectedProductionLine;
     });
     initiative.actionList = newArr;
});

預期：輸入給定：892128 結果：

[{name:'Initiative 1', actionList:[]}, {name:'Initiative 2', actionList:[{name:'action 2', productionLine:'892128'}]}]

Answer 1

語法在您的過濾器上看起來不合適：

var newArray = arr.filter(callback(element[, index[, array]])[, thisArg])

查看Array.prototype.filter()

下面的代碼片段應該給你你需要的東西。

 let initiatives = [{ name: 'Initiative 1', actionList: [{ name: 'action 1', productionLine: '436767' }] }, { name: 'Initiative 2', actionList: [{ name: 'action 2', productionLine: '892128' }] }] let selectedProductionLine = '892128'; initiatives.forEach(function(initiative) { newArray = initiative.actionList.filter(function(actionList) { return actionList.productionLine == selectedProductionLine; }); initiative.actionList = newArray }); console.log(initiatives);