It’s simple: use the Array.prototype.flatMap() method along with the object destructuring.
For example, you have this array of objects. Each object contains an array of primitive values:
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"categories": [
{
"forums": [
"-KpOx5Y4AqRr3sB4Ybwj",
"-KsjO4_W3W9Q2Z2UmuPr"
],
"name": "Feedback & Information",
"slug": "feedback-and-information",
"id": "-KpR7vRkiRPpbUd_TVAR"
},
{
"forums": [
"-KsjPat5MWCx-dkjNVg8",
"-KsjPjasLh0TFtZmffEo",
"-Kvd1Vg_ankLYgrxC50F",
"-KvdCowY9mDvM0EH8Pvs",
"-KvhkEl6F673igPtnbso"
],
"name": "Discussions",
"slug": "discussions",
"id": "-KsjPKA6hDuHlQK_lJWO"
},
{
"forums": [
"-Kvclvu_Qd9QdS9ciqUl",
"-KvcmOcppNYK8NCesmB9"
],
"name": "Comedy",
"slug": "comedy",
"id": "-KvclpNRjpI5W-j0JQGU"
}
],
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If you want to get the forum strings, using object destructuring and flatMap will provide you the solution:
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const forums = categories.flatMap(({ forums }) => forums);
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The result will give you:
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[
"-KpOx5Y4AqRr3sB4Ybwj",
"-KsjO4_W3W9Q2Z2UmuPr",
"-KsjPat5MWCx-dkjNVg8",
"-KsjPjasLh0TFtZmffEo",
"-Kvd1Vg_ankLYgrxC50F",
"-KvdCowY9mDvM0EH8Pvs",
"-KvhkEl6F673igPtnbso",
"-Kvclvu_Qd9QdS9ciqUl",
"-KvcmOcppNYK8NCesmB9"
]
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Check out the JSFiddle demo to prove it.
Enjoy!
Credit : Photo by Alev Takil on Unsplash.
