filterting/removing an item from object in typescript

Issue

How do we filter an object in angular or typescript to remove object that has an empty value for example remove object where annualRent === null . Also what rounding solution can we use to round for example 2.8333333333333335 to 2.83 and remove the other additional decimals like 3333 ....

Thanks.

what I tried and have in mind , something like

array.filter((x): x is MyType => x !== null);

#sample object

[
    {
        "id": 0,
        "type": 0,
        "startDate": "2021-09-27T16:00:00.000Z",
        "endDate": "2021-09-29T16:00:00.000Z",
        "endDateString": "09/30/2021",
        "annualRent": "23232",
        "endDateError": null
    },
    {
        "id": 1,
        "startDate": "2021-09-27T16:00:00.000Z",
        "endDate": "2021-09-29T16:00:00.000Z",
        "endDateString": null,
        "annualRent": null,
        "prevEndDate": "2021-09-29T16:00:00.000Z",
        "useFMV": false
    }
]

Solution

You can use the filter method as follows:

arr = [
    {
        "id": 0,
        "type": 0,
        "startDate": "2021-09-27T16:00:00.000Z",
        "endDate": "2021-09-29T16:00:00.000Z",
        "endDateString": "09/30/2021",
        "annualRent": "23232",
        "endDateError": null
    },
    {
        "id": 1,
        "startDate": "2021-09-27T16:00:00.000Z",
        "endDate": "2021-09-29T16:00:00.000Z",
        "endDateString": null,
        "annualRent": null,
        "prevEndDate": "2021-09-29T16:00:00.000Z",
        "useFMV": false
    }
].filter(obj=> obj.annualRent !== null);
console.log(arr);

You can use the method toFixed() to get the number of digits as follows

let num = 2.8333333333333335;
let roundedNum = num.toFixed(2)
console.log(roundedNum);

Answered By - deepakchethan