I have an object that looks like the following:
const test = {
leagues: [
{
timezone: "GMT",
date: "1/2/2",
premierLeague: [
{ name: "Liverpool", age: 1892 },
{ name: "Manchester Utd", age: 1878 }
],
laLiga: [
{
team: "Real Madrid",
stadium: "Bernabeu"
},
{
team: "Barcelona",
stadium: "Camp Nou"
}
]
}
]
};
and I want the result to look like
const result = [
{ name: "Liverpool", age: 1892 },
{ name: "Manchester Utd", age: 1878 },
{
team: "Real Madrid",
stadium: "Bernabeu"
},
{
team: "Barcelona",
stadium: "Camp Nou"
}
];
I have tried to use flat() but am having trouble getting the arrays within the leagues. The result will be dynamic so I need to be able to get all the arrays within leagues. Can anyone point me in the correct direction to do this?
If your object structure doesn't go an deeper than that, this long one-liner should work:
const result = test.leagues.reduce((arr, obj) => Object.values(val).reduce((innerArr, val) => Array.isArray(val) ? innerArr.concat(val) : innerArr, arr), []);
Somewhat ungolfed:
const result = test.leagues.reduce((arr, obj) => {
return Object.values(val).reduce((innerArr, val) => {
return Array.isArray(val)
? innerArr.concat(val)
: innerArr
}, arr);
}), []);
You might be looking for
const result = test.leagues.flatMap(league =>
Object.values(league).filter(Array.isArray).flat()
);
This sounds weird, you'll end up with objects of different shapes in the same array. I'm not sure how you'll deal with that.
It looks like you're trying to concatenate every value of test.leagues that is itself an array.
const test = {
leagues: [{
timezone: "GMT",
date: "1/2/2",
premierLeague: [{
name: "Liverpool",
age: 1892
},
{
name: "Manchester Utd",
age: 1878
}
],
laLiga: [{
team: "Real Madrid",
stadium: "Bernabeu"
},
{
team: "Barcelona",
stadium: "Camp Nou"
}
]
}]
};
const output = [];
for (const league of test.leagues) {
for (const key in league) {
if (Array.isArray(league[key])) {
// Push each element in `league[key]` onto `output`
// so we don't have to flatten it later
output.push(...league[key]);
}
}
}
console.log({
output
});