在lodash / es6中搜索嵌套數組

Question

在數組數組中搜索值並返回索引。 大多數答案是對象數組。 所以我想搜索例如22並獲得2作為找到值的索引

這是代碼筆https://codesandbox.io/s/lodash-playground-array-pzzhe

 const arr = [["a","b"],["f","r"],["r",22,"t"]]; console.log("arr", arr); 

Answer 1

您可以使用帶有Array#findIndex和Array#includes Array#findIndex純Javascript。

 var array = [["a", "b"], ["f", "r"], ["r", 22, "t"]], value = 22, index = array.findIndex(a => a.includes(value)); console.log(index); 

Answer 2

選項1使用findIndex

 const arr = [["a","b"],["f","r"],["r",22,"t"]]; console.log(arr.findIndex(a => a.includes(22))); 

選項2 ：使用indexOf函數，並包括 ：

 const arr = [["a","b"],["f","r"],["r",22,"t"]]; // find element const element = arr.find(a => a.includes(22)); // find element index const currentIndex = arr.indexOf(element) console.log(currentIndex); 

Answer 3

 indexOfFlat = (val, array) => array.findIndex(_arr => _arr.includes(val)); const arr = [["a","b"],["f","r"],["r",22,"t"]]; console.log("arr", arr); console.log("index", indexOfFlat(22, arr)) 

 <script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.11/lodash.core.min.js"></script> 

Answer 4

萬一您實際上需要在其中找到該值的子數組，則也可以使用Array.find及其index並獲取兩者：

 const arr = [["a","b"],["f","r"],["r",22,"t"]]; let index, subArr = arr.find((x,i) => x.includes(22) && ~(index=i)) console.log('sub-array: ', subArr) console.log('index: ', index)