If I know an object exists in an array with a unique key:value pair do I have use .find() to get the object or is there a way that doesn't require iteration?
Given:
const testObj = [
{id: '001', first: 'fThing1', other: [{id: '001.1'}, {id: '001.2'}], arr: ['a1', 'b1', 'c1'] },
{id: '002', first: 'fThing2', other: [{id: '002.1'}, {id: '002.2'}], arr: ['a2', 'b2', 'c2'] },
{id: '003', first: 'fThing3', other: [{id: '003.1'}, {id: '003.2'}], arr: ['a3', 'b3', 'c3'] }
]
Is there a notation to do:
testObj.id['001'](some notation)first = 'something'
Or do I have to do:
temp = testObj.find(to => to.id === '001')
temp.first = 'something'
To directly answer your question...
Is there a notation to do
The answer is "no".
If your elements have unique IDs, considering collecting them into a Map keyed by id if you need that sort of access...
const testObj = [{"id":"001","first":"fThing1","other":[{"id":"001.1"},{"id":"001.2"}],"arr":["a1","b1","c1"]},{"id":"002","first":"fThing2","other":[{"id":"002.1"},{"id":"002.2"}],"arr":["a2","b2","c2"]},{"id":"003","first":"fThing3","other":[{"id":"003.1"},{"id":"003.2"}],"arr":["a3","b3","c3"]}]
const idMap = new Map(testObj.map(o => [o.id, o]))
// word of warning, this will error if the ID doesn't exist
idMap.get("001").first = "something"
console.log(testObj[0]).as-console-wrapper { max-height: 100% !important; }Because the object references in testObj and the Map are the same, any changes to one will be reflected in the other.
As @Phil mentioned, the notation you asked about is not possible.
Another option is to use function .map() to return a new array with updated objects:
const testObj = [
{id: '001', first: 'fThing1', other: [{id: '001.1'}, {id: '001.2'}], arr: ['a1', 'b1', 'c1'] },
{id: '002', first: 'fThing2', other: [{id: '002.1'}, {id: '002.2'}], arr: ['a2', 'b2', 'c2'] },
{id: '003', first: 'fThing3', other: [{id: '003.1'}, {id: '003.2'}], arr: ['a3', 'b3', 'c3'] }
];
const result = testObj.map(item =>
item.id === '001' ? {
...item,
first: 'something'
} : item
);
console.log(result);