How to Iterate Array of Array

Question

I have an array of array data. I want to loop array of array value and get the first values of each array.

var myArr= [
 ["1",10],
 ["2",20],
 ["3",34]
]

I need to get the first value of each array. Here first value is a string value. How to get "1","2","3" these string value using loop.

This is a **very** basic question, that you should be able to search for. What research have you done? — Taplar, Jul 25 '18 at 15:07
Possible duplicate of https://stackoverflow.com/questions/7106410/looping-through-arrays-of-arrays — Bhavin Shah, Jul 25 '18 at 15:15

samuellawrentz · Answer 1 · 2018-07-25T15:18:25.620

0

var myArr= [
 ["1",10],
 ["2",20],
 ["3",34]
]

console.log(myArr.map(item=>item[0]));

You could use map function. This will return an array containing only the first values of each array in the main array.

Reference: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/map

edited Jul 25 '18 at 15:18

answered Jul 25 '18 at 15:08

samuellawrentz

1,662
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1

He doesn't need a map. He just needs to loop over the first, and only, element in the outer most array. A simple search engine attempt at "loop over an array in javascript" would tell him how to do this. – Taplar Jul 25 '18 at 15:10
Agreed! Just wanted to show the capabilities of array functions in Javascript :) – samuellawrentz Jul 25 '18 at 15:12

score 0 · Answer 2 · answered Jul 25 '18 at 15:11

to iterate over an array and just do an action with it you can use .forEach if you would like to iterate over an array and return a new array you can use .map

in this case to just log the first item of each sub array you can

myArr.forEach(x => console.log(x[0])

How to Iterate Array of Array

2 Answers2