在多維數組在javascript

Question

這個問題是跟進拿到指標， Get the index of a multidimensional array with the value of a given string in javascript

我想這個答案，

var a1 = [["present",["John","Josh","Jay"]],["absent",["May","Mary","Mary Jane"]]], 
    a2 = [["J",["John","Josh","Jay"]],["M",["May","Mary","Mary Jane"]],["S",["Sally","Sam","Sammy Davis"]]], 
getStatus = (a,n) => a.find(e => e[1].indexOf(n) !== -1)[0], 
getIndex = (a,n) => a.findIndex(e => e[1].indexOf(n) !== -1); 

console.log(getStatus(a1,"Mary")); 
console.log(getIndex(a2,"Sammy Davis")); 

這是工作，但也有問題。 如果給定的字符串不在數組中，該怎麼辦？如何處理？ 如何獲得所有索引，如果有多個索引具有給定字符串的值？

例如，在A1，

var a1 = ["present",["John","Josh","Jay"]],["absent",["May","Josh","Mary Jane"]]] 

如何獲得0,1？使用getIndex（）？

Answer 1

我必須同意@Rob M.的評論，但你仍然可以這樣做：

var a1 = [["present",["John","Josh","Jay"]],["absent",["May","Mary","Mary Jane"]]], 
 
     a2 = [["J",["John","Josh","Jay"]],["M",["May","Mary","Mary Jane"]],["S",["Sally","Sam","Sammy Davis"]]], 
 
getStatus = (a,n) => a.find(e => e[1].indexOf(n) !== -1)[0], 
 
getIndex = (a,n) => { var x = -1; 
 
         return [a.findIndex(e => (x = e[1].indexOf(n), x !== -1)),x]; 
 
        }; 
 
console.log(getIndex(a2,"May")); 
 
console.log(getIndex(a2,"Sammy Davis")); 
 
console.log(getIndex(a2,"Daniel"));