const array = [{
id: 1,
name: 'test',
attrs: [{
name: 'Attribute 1',
description: 'Description 1',
}],
values: [{
name: 'value 1',
attrs: [{
name: 'Attribute 1',
type: 'Type 1',
},
{
name: 'Attribute 2',
type: 'Type 2',
},
],
}, ],
}, ];
const newArray =
array.map((item) => {
return {
...item,
isNegative: true
};
});
console.log(newArray);I receive data as displayed in the const array. I need to push a value ‘isNegative’ to array[].attrs and to each values.attrs. I’m only able to do it to the array[].attrs. How can I do it to the others?
>Solution :
You’re only mapping over the top-level array. If you need to map over the arrays within each object, that’s another call to .map(). For example:
const array = [{
id: 1,
name: 'test',
attrs: [{
name: 'Attribute 1',
description: 'Description 1',
}],
values: [{
name: 'value 1',
attrs: [{
name: 'Attribute 1',
type: 'Type 1',
},
{
name: 'Attribute 2',
type: 'Type 2',
},
],
}, ],
}, ];
const newArray =
array.map((item) => {
return {
...item,
isNegative: true,
attrs: item.attrs.map((attr) => {
return {
...attr,
isNegative: true
}
})
};
});
console.log(newArray);Same with the values property, any array within objects in values, etc. Any array that you want to map to a new structure, call .map() on it.