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I have few arrays with objects and I need to merge them in to one, but next code doesn't works, it return empty array:

let y = [{id:1, value: 'test1'}, {id:2, value: 'test2'}]; let z = [{id:3, value: 'test3'}, {id:4, value: 'test4'}]; let x = [{id:5, value: 'test5'}, {id:6, value: 'test6'}]; let arr = []; arr.concat(...x,...y,...z); console.log(arr);

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  • let arr = [...y, ...x, ...z]; Commented Sep 14, 2020 at 12:55
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    arr.concat returns a new array…!? It does not modify arr in place. Commented Sep 14, 2020 at 12:55
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    concat creates a new array. Change it to arr.push(...x,...y,...z) Commented Sep 14, 2020 at 13:01

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Array.prototype.concat()

The concat() method is used to merge two or more arrays. This method does not change the existing arrays, but instead returns a new array

let y = [{id:1, value: 'test1'}, {id:2, value: 'test2'}]; let z = [{id:3, value: 'test3'}, {id:4, value: 'test4'}]; let x = [{id:5, value: 'test5'}, {id:6, value: 'test6'}]; let arr = [].concat(...x,...y,...z); console.log(arr);

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Or just [].concat(x,y,z)

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