I have an array like this:
[
32545343: {
data: [{id: 1}, {id: 2}]
},
547347: {
data: [{id: 1}, {id: 4}]
},
95757: {
data: [{id: 1}, {id: 6}]
},
]
How can I merge all data array in a single array without duplicating objects with the same id, like this:
[{id: 1}, {id: 2}, {id: 4}, {id: 6}]
Solution with using Set
structure
var d = { 32545343: { data: [{ id: 1 }, { id: 2 }] }, 547347: { data: [{ id: 1 }, { id: 4 }] }, 95757: { data: [{ id: 1 }, { id: 6 }] }, }; var set = new Set(); Object.keys(d).forEach(a => d[a].data.forEach(b => set.add(JSON.stringify(b)))); document.write(Array.from(set));
Assuming, you have an object, then this solution would work with a temoprary object for collecting same object.
var data = { 32545343: { data: [{ id: 1 }, { id: 2 }] }, 547347: { data: [{ id: 1 }, { id: 4 }] }, 95757: { data: [{ id: 1 }, { id: 6 }] } }, result = function (object) { var r = []; Object.keys(object).forEach(function (k) { object[k].data.forEach(function (a) { if (!this[a.id]) { this[a.id] = a; r.push(a); } }, this); }, {}); return r; }(data); document.write('<pre>' + JSON.stringify(result, 0, 4) + '</pre>');
The question is not correct, you cannot define array like a map: [ x: 1, y:1 ], correct definition:
var a = {
32545343: {
data: [{id: 1}, {id: 2}]
},
547347: {
data: [{id: 1}, {id: 4}]
},
95757: {
data: [{id: 1}, {id: 6}]
}
};
one solution is using a flatmap (one implementation is here: https://gist.github.com/samgiles/762ee337dff48623e729 )
Array.prototype.flatMap = function(lambda) {
return Array.prototype.concat.apply([], this.map(lambda));
};
then you can convert (do not forget a is not an array it is an object!)
var b = Object.keys(a).flatMap(function(key) { return a[key].data; });
// than you can distinct the list:
var result = b.filter(function(element, index, arr) { return arr.slice(index+1).filter(function(e) { return e.id === element.id }).length===0; });
console.log(result);
You could adopt a functional approach where you pick out unique objects from a flattened array created from each object's data array.
function flatten(arr) {
return arr.reduce(function (p, c) {
return p.concat(c);
}, []);
}
function pluck(obj, key) {
return Object.keys(obj).map(function (el) {
return obj[el][key];
});
}
function unique(arr, key) {
var ids = [];
return arr.filter(function (el) {
if (ids.indexOf(el[key]) === -1) {
ids.push(el[key]);
return true;
}
});
}
var result = unique(flatten(pluck(obj, 'data')), 'id');
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