How to retrieve the value from an array without index

Question

[["Django UnChainers","AA-24010"],["General","AA-26191"]]

I have one array in above form. I want to retrieve all the value with prefix AA (which are in the second position). Is there any way where I can fetch the value by passing prefix?.

I know the way where I can get the value by passing index but may be tomorrow index can get change so is it possible to fetch the value by passing prefix?

Answer 1

In case OP wants a function to do this.

 function(arr, pattern){ return arr.map(function(x){ return x.filter( word => ~ word.indexOf(pattern)) }); } 

 var arr = [ [ "Django UnChainers", "AA-24010" ], [ "General", "AA-26191" ]]; var list = arr.map(function(x){ if(~(x[1].indexOf('AA'))){ return x[1]; } }); console.log(list); 

In case the index changes in future, iterate through each string and check for the "AA" string. Check the below code.

 var arr = [ [ "Django UnChainers", "AA-24010" ], [ "General", "AA-26191" ]]; var list = arr.map(function(x){ return x.filter( word => ~ word.indexOf('AA')) }); console.log(list); 

Answer 2

this is shorter

var = [nested array]
a.filter(x => x[1].startsWith('AA'))
//in case you are not sure about the index 
a.filter(x => x.filter(y => y.startsWith('AA').length > 0))