How to append a new item to same index in same array inside the for loop

Question

i have obj of array

var data = [{
    value: 1,
    t: 1487203500000
}, {
    value: 2,
    t: 1487213700000
}];

here, i need to compare t obj at inside a loop, if it is exceeds 5 mins, then i need to create a one item with value of null and append into that array.

Expected result will be

var data = [{
    value: 1,
    t: 1487203500000
}, {
    value: null,
    t: null
} {
    value: 2,
    t: 1487213700000
}];

while appending i need to push into same index and existing value should be readjusted.

What exactly if it is exceeds 5 mins means for you? What do you want to compare your data[0]["t"] to? Because obviously all of them exceed 5minutes (by years). Do you want to compare one item to the next, like data[1]["t"] - data[0]["t"] > 5 * 60 * 1000, and if so, insert the null object between them, so data[1] becomes data[2]? — wscourge
– wscourge, Commented Feb 24, 2017 at 6:35
@wscourge, yes same expectation only, it should change from data[1] to data[2] nd comparing by t — Mohaideen
– Mohaideen, Commented Feb 24, 2017 at 7:23
I dont understand your comment since nd comparing by t. Could you please explain what exactly does if it is exceeds 5 mins mean? — wscourge
– wscourge, Commented Feb 24, 2017 at 7:30

Raman Sahasi · Accepted Answer · 2017-02-24 07:39:46Z

1

You can use array.splice() for this

The splice() method adds/removes items to/from an array.

var data = [{
    value: 1,
    t: 1487203500000
}, {
    value: 2,
    t: 1487213700000
}];

//  put your index here
//          v
data.splice(1, 0, {value: null, t: null});

console.log(JSON.stringify(data, 0, 8));

In this code

data.splice(1, 0, {value: null, t: null});

1st Parameter (1) -> indicates the position where you want to insert.
2nd Parameter (0) -> indicates how many elements you want to remove.
3rd Parameter ({obj}) -> is the object which we want to insert at position 1.

edited Feb 24, 2017 at 7:39

answered Feb 24, 2017 at 7:34

Raman Sahasi

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