For one of my e-commerce application requirement, I have a nested array of the form (Sample):
const data = [
{
"id": 1,
"group": "upper-wear",
"labels": [
{
"type": "shirts",
"quantity": "20",
},
],
popular: true
},
{
"id": 2,
"group": "bottom-wear",
"lables": [
{
"type": "trousers",
"quantity": "31",
},
],
popular: true
},
]
To this array, I need to insert new objects to the array 'labels' if the group value equals 'upper-wear'.
const newDataToInsert = [
{
"type": 'blazers',
"quantity": 19
},
]
This is what I tried so far, considering that for now I only need to insert to single label (i.e. 'upper-wear') (in future, there can be multiple labels category 'upper-wear', 'bottom-wear', to be inserted into):
const updatedArray = data.map((datum) => {
if (datum.group === 'upper-wear') {
return {
...datum,
labels: [...datum.labels, ...newDataToInsert]
};
}
});
console.log(updatedArray);
But there seems to be a silly issue that I am missing as the result returns like this:
[
{
id: 1,
group: 'upper-wear',
labels: [ [Object], [Object] ],
popular: true
},
undefined
]
I know there may be better approaches available, but this is what I can think of as the minimum solution for now.
any help to resolve the current or any better solution will be highly appreciated.
Try with this
updatedArray = data.map((d) => {
if (d.group && d.group === 'upper-wear') {
return { ...d, labels: d.labels.concat(newDataToInsert) }
} else {
return d;
}
})
const data = [
{
"id": 1,
"group": "upper-wear",
"labels": [
{
"type": "shirts",
"quantity": "20",
},
],
popular: true
},
{
"id": 2,
"group": "bottom-wear",
"lables": [
{
"type": "trousers",
"quantity": "31",
},
],
popular: true
},
];
const newDataToInsert = [
{
"type": 'blazers',
"quantity": 19
},
];
const updatedArray = data.map((d) => {
if (d.group && d.group === 'upper-wear') {
return { ...d, labels: d.labels.concat(newDataToInsert) }
} else {
return d;
}
});
console.log(updatedArray)Explaination
Here while mapping the data, we check for the condition
IF
b return { ...b }lables return { ...d, labels: d.labels.concat(newDataToInsert) },As per the JSON default nature the new variable with the same name will hold the latest valuenewDataToInsert array labels: d.labels.concat(newDataToInsert), It will merge 2 arrays and store them in JSON with the name labelsElse
else { return d; }You don't actually need to iterate with map over the array. Just find an object in the array and change what you want.
const data=[{id:1,group:"upper-wear",labels:[{type:"shirts",quantity:"20"}],popular:true},{id:2,group:"bottom-wear",lables:[{type:"trousers",quantity:"31"}],popular:true}];
const newDataToInsert=[{type:"blazers",quantity:19}];
data.find(({ group }) => group === 'upper-wear')?.labels.push(...newDataToInsert);
console.log(data);.as-console-wrapper { max-height: 100% !important; top: 0; }You're not returning all objects from your map. you're only returning a result when your criteria is met. This is resulting in your undefined objects...
const data = [
{ "id": 1, "group": "upper-wear", "labels": [ { "type": "shirts", "quantity": "20", }, ], popular: true },
{ "id": 2, "group": "bottom-wear", "lables": [ { "type": "trousers", "quantity": "31", }, ], popular: true },
]
const newDataToInsert = [ { "type": 'blazers',"quantity": 19 }, ]
const updatedArray = data.map(datum => {
if (datum.group === 'upper-wear') datum.labels = [...datum.labels, ...newDataToInsert]
return datum
});
console.log(updatedArray);