how can i return an array of objects taking from array of again one more level array. I am using push.
is there any better way to achieve this
let a = [{b: [{c: "k"}]}]
let o = []
a.forEach(so => {so.b.forEach(obc => o.push(obc))})
console.log(o)
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2 Answers
I'd use flatMap() instead:
const a = [{
b: [{
foo: 'foo'
}]
},
{
b: [{
c: "k"
},
{
bar: 'bar'
}
]
}
];
const o = a.flatMap(({ b }) => b);
console.log(o);(but this is a relatively new method, so if you want to use it and still support older environments, be sure to include a polyfill)
Lacking that, you can also improve your existing code by using concat() with the inner array instead of iterating over each inner item:
const a = [{
b: [{
foo: 'foo'
}]
},
{
b: [{
c: "k"
},
{
bar: 'bar'
}
]
}
];
let o = [];
a.forEach(({ b }) => {
o = o.concat(b);
});
console.log(o);
answered Aug 28, 2019 at 8:12
CertainPerformance
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1 Comment
Beginner
without using polyfill anyother methods or its better to use array.push
Try
let a = [{b: [{c: "k"}]}]
let o =a[0].b
console.log(o)