I would like to know how could I merge an array of arrays. For example, I have the following array:
[ [ {marca: 'fiat', modelo: 'palio'} ], [ {marca: 'nissan', modelo: 'march'} ] ]
I'd like to get this array, after merging the array above:
[ {marca: 'fiat', modelo: 'palio'}, {marca: 'nissan', modelo: 'march'} ]
Thanks, guys, I appreciate it.
You can use the ES6-spread operator in combination with Array.reduce, e.g.
const arr = [ [ {marca: 'fiat', modelo: 'palio'} ], [ {marca: 'nissan', modelo: 'march'} ] ];
console.log(arr.reduce((a, b) => [...a, ...b], [])); You can give a try to the new, but still experimental, flat() method of arrays...
const input = [
[ {marca: 'fiat', modelo: 'palio'} ],
[ {marca: 'nissan', modelo: 'march'} ]
];
console.log(input.flat());Or alternatively use reduce() like this:
const input = [
[ {marca: 'fiat', modelo: 'palio'}, {marca: 'fiat', modelo: 'fiesta'} ],
[ {marca: 'nissan', modelo: 'march'} ]
];
let res = input.reduce((acc, curr) => acc.push(...curr) && acc, []);
console.log(res);
modelo also. My mistake, sorry! updated now!There are a number of ways this can be done. Assuming your input data is such that each item of the input array is an array itself with one item, the use of Array#map would be sufficient:
const input = [
[{
marca: 'fiat',
modelo: 'palio'
}],
[{
marca: 'nissan',
modelo: 'march'
}]
];
/*
For each subArray of input array where the subArray
is known to have a single element, extract that single
element and return it as the result of each map iteration
*/
const output = input.map(([item]) => item)
console.log(output)Alternatively, for a more general solution that "flattens" an array of array items that have variable length, you could achieve that via Array#reduce as follows:
const input = [
[{
marca: 'fiat',
modelo: 'palio'
}, {
test: 'foo'
}],
[{
marca: 'nissan',
modelo: 'march'
}]
];
const output = input.reduce((finalArray, subArray) => {
/*
For each item being iterated during reduce, concat
the subArray to the finalArray
*/
return finalArray.concat(subArray);
}, [])
console.log(output)For the record, if you are using NodeJs, there is a package named array-flatten, you can install it with
npm install array-flatten --save
For example:
var flatten = require('array-flatten')
flatten([1, [2, [3, [4, [5], 6], 7], 8], 9])
//=> [1, 2, 3, 4, 5, 6, 7, 8, 9]
There are a few ways of doing this, I would recommend Reduce, as there is no need to be installing npm packages when not needed.
let arrays = [
[{
marca: 'fiat',
modelo: 'palio'
}],
[{
marca: 'nissan',
modelo: 'march'
}]
]
arrays = arrays.reduce((a, b) => a.concat(b), []);
console.log(arrays);I used lodash's flattenDeep method to solve it. For example:
_.flattenDeep(Array)
Thank you all for the answers.
Where implemented, you can use the standard Array's flat method:
let arr = [ [ {marca: 'fiat', modelo: 'palio'} ], [ {marca: 'nissan', modelo: 'march'} ] ];
console.log(arr.flat());
As alternative, if it's just a shallow flat, you can obtain the same result with concat and spread operator:
console.log([].concat(...arr));
