We Keep Coding

Finding like values and appending items to array (javascript)

I have two arrays I'm trying to combine in a very specific way and I need a little guidance. Array1 is an array of dates 30-40 items, Array 2 is a list of objects with a date inside one of the attributes. I'm trying to append the object in array 2 to the index of array1 when the dates match.
I want to put arr2 in the same index as arr1 if the dates match.
const arr = [
"2022-06-26T07:00:00.000Z",
"2022-06-27T07:00:00.000Z",
"2022-06-28T07:00:00.000Z",
"2022-06-29T07:00:00.000Z",
"2022-06-30T07:00:00.000Z",
"2022-07-01T07:00:00.000Z",
"2022-07-02T07:00:00.000Z",
"2022-07-03T07:00:00.000Z",
"2022-07-04T07:00:00.000Z",
"2022-07-05T07:00:00.000Z",
"2022-07-06T07:00:00.000Z",
"2022-07-07T07:00:00.000Z",
"2022-07-08T07:00:00.000Z",
"2022-07-09T07:00:00.000Z",
"2022-07-10T07:00:00.000Z",
"2022-07-11T07:00:00.000Z",
"2022-07-12T07:00:00.000Z",
"2022-07-13T07:00:00.000Z",
"2022-07-14T07:00:00.000Z",
"2022-07-15T07:00:00.000Z",
"2022-07-16T07:00:00.000Z",
"2022-07-17T07:00:00.000Z",
"2022-07-18T07:00:00.000Z",
"2022-07-19T07:00:00.000Z",
"2022-07-20T07:00:00.000Z",
"2022-07-21T07:00:00.000Z",
"2022-07-22T07:00:00.000Z",
"2022-07-23T07:00:00.000Z",
"2022-07-24T07:00:00.000Z",
"2022-07-25T07:00:00.000Z",
"2022-07-26T07:00:00.000Z",
"2022-07-27T07:00:00.000Z",
"2022-07-28T07:00:00.000Z",
"2022-07-29T07:00:00.000Z",
"2022-07-30T07:00:00.000Z",
"2022-07-31T07:00:00.000Z",
"2022-08-01T07:00:00.000Z",
"2022-08-02T07:00:00.000Z",
"2022-08-03T07:00:00.000Z",
"2022-08-04T07:00:00.000Z",
"2022-08-05T07:00:00.000Z",
"2022-08-06T07:00:00.000Z"
]
const arr2 = [
{
"gsi1SK": "name ",
"searchPK": "thing",
"SK": "uuid",
"Desc": "place #1205",
"PK": "thing uuid",
"searchSK": "7/1/2022",
"gsi1PK": "thing",
"Complete": false,
"Users": [
"person1",
"person2"
]
},
{
"gsi1SK": "name",
"searchPK": "thing",
"SK": "uuid",
"Desc": "place#124124",
"PK": "thing uuid",
"searchSK": "7/4/2022",
"gsi1PK": "thing",
"Complete": false,
"Users": [
"person2",
"person45"
]
}
]
console.log([arr, arr2]);

You seem to have a handle on the date conversion part. Here I've defined two short sample arrays to represent arr2 and newArr. Then, a map function to create the output.
const arr2 = [
{
"OTHER_FIELDS": "TOP SECRET",
"searchSK":"7/4/2022"
},
{
"OTHER_FIELDS": "TOP SECRET",
"searchSK":"7/9/2022"
}
];
const newArr = [
[
"7/2/2022"
],
[
"7/3/2022"
],
[
"7/4/2022"
],
[
"7/5/2022"
],
[
"7/6/2022"
],
[
"7/7/2022"
],
[
"7/8/2022"
],
[
"7/9/2022"
],
[
"7/10/2022"
]
];
// for each subarray in newArr, return an array containing the existing element plus any elements from arr2 found by the filter function
const output = newArr.map(el => [...el, ...arr2.filter(a2 => a2.searchSK === el[0])]);
console.log(output);

Plan
You've got two obvious options:
A. Look at each of the objects, finding a home for each one in turn
B. Look at each of the dates, collecting all the objects that belong to it
Which method makes more sense for you will depend on other factors you haven't covered in your post. I think the main question is: is it guaranteed that the date list will contain a proper home for every object? If no, then do you want to drop the objects without proper homes, or do you want to create a proper home for the objects
Performance can also matter, but really only if you expect either list to be very long or if you need to run this process multiple times (such as in a React component in the browser).
Implement
Loop through the list you chose. For each item, scan the other list for the relevant item(s): its home or its children. Take the appropriate action for those items depending on which plan you chose.
Another consideration is: don't mutate your arguments. That means you probably need to create copies of the two input arrays before you do the work. If the arrays contain objects rather than scalars, you can't just do array.slice() to create a copy.
For an array of POJOs, you can convert the source to a string and then back again to create a clone.
The array of dates will need special handling, because JSON.parse will not revive dates.
Mutating arguments is generally a bad practice, at least in the functional paradigm that underlies many popular front-end frameworks today. Plus, if you create your own copies of the input data, you can gain efficiency by moving items from the source arrays to the output array, which means that subsequent iterations won't have to re-examine items that have already been processed.

custom sort order on array of objects where the objects are different lengths and dynamic

The objects are pulled from the backend, the objects can be different lengths and can contain different values.
I want to custom sort these objects in this order of the array below:
let array = ["packhouse", "location", "date", "time"]
this is what I can do (searching through the web):
var myArray = [{
name: 'packhouse'
},
{
name: 'notPackhouse',
date: "date"
},
{
name: 'a'
},
];
myArray.sort(function(a, b) {
return array.indexOf(a.name) - sortOrder.indexOf(b.name);
});
the data being pulled doesnt always have "packhouse" or could be a bigger length than the custom order array. is there a better solution for this?

Get info from Array then Object in Javascript

I'm trying to display data after a Fetch. I grouped this data by date so I grouped my objects into an array which have the date as main key.
But now, I'm kind of lost and don't know how to display get the date as Header section then the objects.
This is my data:
"31 janvier 2015": Array [
Object {
"image": "image",
"name": "name",
},
Object {
"image": "image",
"name": "name",
},
],
"02 février 2016": Array [
Object {
"image": "image",
"name": "name",
},
Object {
"image": "image",
"name": "name",
},
]
What I would like to do is to display it like a section list :
31 janvier 2015
> object
> object
02 février 2016
> object
> object
I think I can map the objects but first I have to get the date and go inside that array.

What you have is an associative array, that is an array that instead of numeric indexes has strings. It works just like an object would if you were for example to do person['age'] on a person object.
You can loop through the "indexes" with the below code, checking hasOwnProperty to avoid any inherited properties. You can then access your dates by key
for (var key in MainArray) {
if (MainArray.hasOwnProperty(key))
console.log(MainArray[key]);
}

Iterate over the map keys, displaying the date and listing the items.
for(let date in list){
// Date as SECTION HEADING
console.log(date);
// access items...
const items = list[date];
// Display item
items.forEach(console.log);
}

Converting JS array UNIX date integers into JS Date objects

Is there a way to convert UNIX epoch integers (1402079444, etc) in an array into JavaScript Date objects (Date.UTC(2014, 9, 14), etc) using jQuery?
I'm trying to pass a large JSON array generated by PHP to Highmaps.JS, which almost works great however Highmaps expects a Date object and Date objects aren't valid JSON, so I can't generate them with PHP.
jsFiddle of my current setup here: http://jsfiddle.net/dwgLtscm/2/
(The x-axis isn't displaying dates properly because the data isn't in the proper date format).
[{
"name": "Dissolved Oxygen",
"data": [
[1402079444,9]
]
},
{
"name": "Temperature (Water)",
"data": [
[1401291099,9],
[1401862547,12]
]
},
{
"name": "Temperature (Air)",
"data": [
[1401291099,13],
[1401862547,19]
]
},
]

Given the Json object above, I'd try:
array.forEach(function (val) {
val.data = val.data.map(function (datum) {
return [ new Date(datum[0] * 1000), datum[1] ];
}
}
Unless I'm reading it wrong (I'm assuming data[0] is the UTC value).
(Edited based on feedback below, thanks all!)

What is the correct format of populating a JSON object with a nested array of objects?

I'm trying to create a JSON object with a nested array of JSON objects. What is the correct format of this?
Here is an example what I am trying to create:
{
"reviewCount": 96,
"reviews": [
{"name": "Sean Steinman", "date": "reviewed 2 weeks ago", "reviewContent": "Fantastic Service"},
{"name": "Ryan Lundell", "date": "reviewed in the last week", "reviewContent":"Ask for Scott!"}
]
}
Here is what I have so far:
var reviewObj = {
reviewCount: reviews.length,
reviews: [{name: , date: , reviewContent:}]
}
After I initialize it, I will fill it with a for loop that runs through an existing array of strings.
CLARIFICATION:
The array that I'm using to populate the JSON object is:
[
"\nSean Steinman\nreviewed 2 weeks ago\n Fantastic Service\n",
"\nRyan Lundell\nreviewed in the last week\n Ask for Scott!\n• • •\n"
]
So I'm creating a new array in my for with tmpArr = reviews[i].split('/n');, and then where I'm getting stuck is how to stick that into the JSON object as an object.

First, you're not building a "JSON" object. You're just building an object. It's not JSON until you JSON-encode it. {"name": "bob"} is not JSON, it's an object literal. '{"name": "bob"}', the string, is JSON.
Second, you cannot loop inside an object literal, which is what your second code example seems to indicate you're trying to do. Instead, you need to initialize you reviews property to an empty array, and then loop and append items to the array.
var reviews = [
"\nSean Steinman\nreviewed 2 weeks ago\n Fantastic Service\n",
"\nRyan Lundell\nreviewed in the last week\n Ask for Scott!\n• • •\n"
];
var reviewObj = {
reviewCount: reviews.length,
reviews: []
}
reviews.forEach(function(line) {
var review = line.split("\n");
reviewObj.reviews.push({name: review[0], date: review[1], reviewContent: review[2]});
});