Javascript nested array to single array without using loop

Question

I have JSON array like this:

var items = [
   [{id:1,name:'test'},{id:2,name:'test'},...]  ,
   [{id:1,name:'test'},{id:2,name:'test'},...]  ,
]

From that I need an array like this:

var newArray = [
  { id: 1, name: 'test' }, { id: 2, name: 'test'}, { id: 3, name: 'test'}, ...
]

Now I am using a for loop on items array and storing into newArray but is there any other method without using loops?

I think i'm not the only who can't understand your question. Please provide more details. — Mihai Alexandru-Ionut, Oct 17 '17 at 07:02
[JSON](http://json.org/) is by definition a string, you have an array, which is not a JSON. — Nina Scholz, Oct 17 '17 at 07:02
Why don't you wish to use a loop, whatever you're going to do it'll involve some sort of a loop. — Tschallacka, Oct 17 '17 at 07:02
@Tschallacka: Depends on if you consider `[].concat.apply([], arrays);` to be a loop. Sure, behind the scenes... — Cerbrus, Oct 17 '17 at 07:05

zer00ne · Answer 1 · 2017-10-17T07:20:40.270

1

Demo 1: concat() and .apply()

Demo 2: reduce() and concat()

Demo 3: ... Spread Operator and concat()

Demo 1

var items = [
   [{id:1,name:'test'},{id:2,name:'test'}]  ,
   [{id:1,name:'test'},{id:2,name:'test'}]  ,
]

var flattened = [].concat.apply([], items);

console.log(flattened);

Demo 2

var items = [
   [{id:1,name:'test'},{id:2,name:'test'}],
   [{id:1,name:'test'},{id:2,name:'test'}]
];

var flattened = items.reduce(function(prev, curr) {
  return prev.concat(curr);
});

console.log(flattened);

Demo 3

var items = [
   [{id:1,name:'test'},{id:2,name:'test'}],
   [{id:1,name:'test'},{id:2,name:'test'}] 
];

var flattened = [].concat(...items);

console.log(flattened);

edited Oct 17 '17 at 07:20

answered Oct 17 '17 at 07:06

zer00ne

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symple always love it – Álvaro Touzón Oct 17 '17 at 07:09
Please don't answer obvious duplicates like this one. Close-vote them instead. – Cerbrus Oct 17 '17 at 07:17

score 1 · Answer 2 · answered Oct 17 '17 at 07:10

I love functional and new prototpes of array so here is my demo

var items = [
   [{id:1,name:'test'},{id:2,name:'test'}]  ,
   [{id:1,name:'test'},{id:2,name:'test'}] 
]
var ll = items.reduce(function(prev, current){return prev.concat(current)})
console.log(ll)

Javascript nested array to single array without using loop

2 Answers2

Demo 1

Demo 2

Demo 3