We Keep Coding

Pushing an object into an object under a certain key

I'm trying to achieve the following Array/Object,
[
1:[{data:data},{data:data}]
]
How would this be achieved?
I got thus far,
var data = [];
data['1'] = {data:data}
but this just overwrites.

The notation [] is for making Arrays, {} is for making Objects.
See the following
const data = {}; // Initialize the object
data['1'] = []// Makes data={'1':[]}
data['1'].push({data: 'data'}) // Makes data = {'1':[{data:'data'}]}
OR
const data = []; // Initialize the Array
data.push([]) // Makes data=[[]]
data[0].push({data: 'data'}) // Makes data = [[{data:'data'}]]

If i get you right you want to push objects into an array inside of an hashtable ( which can be easily implemented using an object in javascript).
So we need an object first:
const lotteries = {};
Now before storing data, we need to check if the relating array exists, if not we need to create it:
function addDataToLottery(lottery, data){
if(!lotteries[lottery]){ //if it doesnt exist
lotteries[lottery] = []; //create a new array
}
//As it exists definetly now, lets add the data
lotteries[lottery].push({data});
}
addDataLottery("1", { what:"ever"});
console.log(lotteries["1"]));
PS: If you want to write it in a fancy way:
class LotteryCollection extends Map {
constructor(){
super();
}
//A way to add an element to one lottery
add(lottery, data){
if(!this.has(lottery)) this.set(lottery, []);
this.get(lottery).push({data});
return this;
}
}
//Create a new instance
const lotteries = new LotteryCollection();
//Add data to it
lotteries
.add("1", {what:"ever"})
.add("1", {sth:"else"})
.add("something", {el:"se"});
console.log(lotteries.get("1"));

How to insert new value into array as per key value using Javascript

I need one help. I need to insert one new value into existing array by matching the key value using Javascript.I am explaining the scenario below.
var galArr=[
{'image':'12.png','comment':'hii','act':'edit'},
{'image':'13.png','comment':'hello','act':'edit'},
{'image':'14.png','comment':'hee','act':'edit'},
]
The above is my existing array.I need to match with the below another array.
var arr=[
{'image':'12.png','comment':'hii'},
{'image':'14.png','comment':'hee'},
]
Here i need to match the array arr with an array galArr if image name will same this checked:true will add in the rective row of existing array galArr. Suppose arr[0].image==galArr[0].image then checked:true will add in that respective row of existing array. Please help me.

This should be sufficient.
var galArr=[
{'image':'12.png','comment':'hii','act':'edit'},
{'image':'13.png','comment':'hello','act':'edit'},
{'image':'14.png','comment':'hee','act':'edit'},
];
var arr=[
{'image':'12.png','comment':'hii'},
{'image':'14.png','comment':'hee'},
];
// start looping over `arr`
arr.forEach(function(o, i){
// now loop over `galArr` to find match
galArr.forEach(function(gO, i){
// when there is a match
if(o.image == gO.image){
console.log(gO);
// add checked property to this object
gO['checked'] = true;
}
});
});
// Output
console.log(galArr);

First of all check condition and if the condition match then create a new temp json and replace it with old json
arr.forEach(function(d){
galArr.forEach(function(e){
if(e.image==d.image){
temp = {};
temp.image = e.image;
temp.comment = e.comment;
temp.checked = e.comment;
temp.action = e.action;
e = temp;
}
});
});

I would create an image index, where its indexes would be the whole image file names and later I would use that image index to quickly check and add checked property to galArr array:
var galArr=[
{'image':'12.png','comment':'hii','act':'edit'},
{'image':'13.png','comment':'hello','act':'edit'},
{'image':'14.png','comment':'hee','act':'edit'},
];
var imageIndex = galArr.map(function(item) {
return item.image;
});
var arr=[
{'image':'12.png','comment':'hii'},
{'image':'14.png','comment':'hee'},
]
arr.forEach(function(item) {
item.checked = imageIndex.indexOf(item.image) > -1;
});
If your users will use your JavaScript code within a modern Web browser, I would use the new Set collection:
var galArr=[
{'image':'12.png','comment':'hii','act':'edit'},
{'image':'13.png','comment':'hello','act':'edit'},
{'image':'14.png','comment':'hee','act':'edit'},
];
var imageIndex = galArr.reduce(function(result, item) {
result.add(item.image);
return result;
}, new Set());
var arr=[
{'image':'12.png','comment':'hii'},
{'image':'14.png','comment':'hee'},
]
arr.forEach(function(item) {
item.checked = imageIndex.has(item.image);
});
I've asked a question to assist everyone in understanding how valueable are sets: Is Set a hashed collection in JavaScript?

Filter properties from an array based on another array

I have an array of objects like this:
var bridges = {"countyCd:15
createdDate:"0001-01-01T00:00:00"
createdUserId:0
createdUserIdZ:null
createdUserName:null
description:"SR 1#.-CENTRAL RR COMP OF IND"
districtId:null
encryptedId1:null
encryptedId2:null
isDirty:false
modelState:null
nbiNumber:10
routeNbr:"1"
routeTypeCd:"SR"
transactionType:null
updatedDate:"0001-01-01T00:00:00"
updatedUserId:0
updatedUserIdZ:null
updatedUserName:null", [...]....}
I have another array like this
[countyCd, nbiNumber]
How can create another array keeping just two properties so it becomes like
bridges = {"countyCd:15
nbiNumber:10"
, [...]....}
Basically, I am looking for a way to create a function that takes a data array and a filter array as parameters and filters the data array based on the filter array.
Any pointers to this will be much appreciated.

One solution would be to map over each record and reduce your filter array into an object containing the target proprties:
var bridges = [{
countyCd:15,
createdDate:"0001-01-01T00:00:00",
createdUserId:0,
createdUserIdZ:null,
createdUserName:null,
description:"SR 1#.-CENTRAL RR COMP OF IND",
districtId:null,
encryptedId1:null,
encryptedId2:null,
isDirty:false,
modelState:null,
nbiNumber:10,
routeNbr:"1",
routeTypeCd:"SR",
transactionType:null,
updatedDate:"0001-01-01T00:00:00",
updatedUserId:0,
updatedUserIdZ:null,
updatedUserName:null
}, {
countyCd:23,
createdDate:"0001-01-01T00:00:00",
createdUserId:0,
createdUserIdZ:null,
createdUserName:null,
description:"SR 1#.-CENTRAL RR COMP OF IND",
districtId:null,
encryptedId1:null,
encryptedId2:null,
isDirty:false,
modelState:null,
nbiNumber:10,
routeNbr:"1",
routeTypeCd:"SR",
transactionType:null,
updatedDate:"0001-01-01T00:00:00",
updatedUserId:0,
updatedUserIdZ:null,
updatedUserName:null
}];
var filters = ['countyCd', 'nbiNumber'];
var transformedRecords = bridges.map(bridge => filters.reduce((p, c) => {
p[c] = bridge[c];
return p;
}, {}));
console.log(transformedRecords);

Say you have an array of bridges, call it bA:
var bA = []; //bridges array
var nbiA = []; // nbia array with countyCd
var newA = []; // new array
bA.forEach(function(element, index, array){
var newEntry = {
'countyCd':element.countyCd,
'nbiNumber':nbiA.find(function(nbi){
return nbi[countyCd] == element.countyCd;
}).nbiNumber
};
newA.push(newEntry);
});
//do whatever you want with the newA array

How would I go about using a multidimensional array variable in javascript

Hi there before I start I did try looking through the search about writing variables so if this has been asked and answered then I do apologise but this is baffling me ....
So here goes ..
example of what I am talking about
var i = e[ab]
var n = e[cd][ef]
var t = e[cd][gh]
I know that when I want var i I can put e.ab but how would I go about writing var n and var t

So assuming your object looks like this (based on your description, it sounds like you want to access an object which is the property of another object), and you want to access them through the indexer properties (which would be a property of a property).
var e = {
ab : "variableOne",
cd : {ef:"ef object"},
gh : {ij:"ij object"},
}
var i = e["ab"]
//if these are properties, then you need to add quotes around them
//to access a property through the indexer, you need a string.
var n = e["cd"]["ef"]
var t = e["gh"]["ij"]
console.log(i);
console.log(n);
console.log(t);
console.log("this does the same thing:")
console.log(e.ab);
console.log(e.cd.ef);
console.log(e.gh.if);
In your example the object would look like
//e is the parameter, but I show it as a variable to show
// it's relation to the object in this example.
e = {
now_playing: {artist:"Bob Seger"; track:"Turn the Page"}}
}
this is different than an array of arrays:
var arr = [
['foo','charlie'],
['yip', 'steve'],
['what', 'bob', 'jane'],
];
console.log(arr[0][0]); //foo
console.log(arr[0][1]); //charlie
console.log(arr[1][0]); //yip
console.log(arr[1][1]); //steve
console.log(arr[2][2]); //jane
https://jsfiddle.net/joo9wfxt/2/
EDIT:
Based on the JSON provided, it looks like parameter e in the function is assigned the value of the item in the array. With your code:
this line will display: "Rock you like a hurricane - Nontas Tzivenis"
$(".song_title .current_show span").html(e.title);
and this line will display: "Rascal Flatts - Life is a Highway".
$(".song_title .current_song span").html(e.np);
If it's not displaying you might want to double check your JQuery selectors. This ".song_title .current_song span" is selecting it by the classes on the element.

I think you are in need of a bit of a refresher on basic JavaScript syntax. Here's how you can assign an "empty object" to a variable, then start to assign values to it's properties:
e = {}
e.ab = {}
e.cd = {}
e.cd.ef = "data"
or you can use the associative array syntax for property access:
e = {}
e["ab"] = {}
e["cd"] = {}
e["cd"]["ef"] = "data"
You see the latter is using the object e like a two-deep associative array. Is that what you are looking to do?

JavaScript is not strongly typed. So an Array "a" could contain objects of different types inside.
var a = [ "a value", [1, 2, 3], function(){ return 5 + 2;}];
var result = a[0]; //get the first item in my array: "a value"
var resultOfIndexedProperty = a[1][0]; //Get the first item of the second item: 1
var resultOfFunc = a[2](); //store the result of the function that is the third item of my array: 7
Hope this helps a little.

For..In Loop Overwriting ALL Array Values

I'm trying to use a for..in loop to iterate through a list of names, add them to a template object ('group'), then add each complete object to an array ('queryList'). This isn't working because each iteration is overwriting ALL values in the array. Any suggestions why this is happening?
// BATTERY OBJECT
var groupList = [ "LOGIN", "BROWSE", "SEARCH"];
// GROUP OBJECT
var group = {dbName: 'CARS', name: '', collectionName: 'group'};
// INIT VARS
var groupName = '',
queryList = [];
// COMPILATION FUNCTION
var buildGroupQueries = function(group){
// BUILD BATCH OF QUERIES
for (var i in groupList){
groupName = groupList[i];
group.name = groupName;
queryList[i] = group;
}
console.log(queryList);
}
buildGroupQueries(group);
It should look like:
[
{"dbName":"CARS","name":"LOGIN","collectionName":"group"},
{"dbName":"CARS","name":"BROWSE","collectionName":"group"},
{"dbName":"CARS","name":"SEARCH","collectionName":"group"}
]
Instead I'm getting:
[
{"dbName":"CARS","name":"SEARCH","collectionName":"group"},
{"dbName":"CARS","name":"SEARCH","collectionName":"group"},
{"dbName":"CARS","name":"SEARCH","collectionName":"group"}
]

You are creating an array of elements referring to the same object, so they all show the same name coinciding with the last time you changed it, which is "SEARCH" in your example.
You have to refer each element to a new object created from the one you want to use as a template.
To do so you can either loop over its properties or clone it as shown below:
// BATTERY OBJECT
var groupList = [ "LOGIN", "BROWSE", "SEARCH"];
// GROUP OBJECT
var group = {dbName: 'CARS', name: '', collectionName: 'group'};
// INIT VARS
var groupName = '',
queryList = [];
// COMPILATION FUNCTION
var buildGroupQueries = function(group){
var i, _group;
// BUILD BATCH OF QUERIES
for (i in groupList){
_group = JSON.parse(JSON.stringify(group));
groupName = groupList[i];
_group.name = groupName;
queryList[i] = _group;
}
console.log(queryList);
}
buildGroupQueries(group);

You modify the group object each time, but you need to modify its copy.
Add this code just after your line for (var i in groupList){
var _group = {};
for (var j in group){ _group[j] = group[j]; }
On each iteration you create a new object and copy to it all properties from the master object.