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javascript check if any array is empty from an object [closed]

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There is an object
let response = {
"meta": {
"id": 781
},
"content": {
"title": "Test",
"min": "1",
"max": "30",
"series": [
{
"name": "A",
"data": []
},
{
"name": "B",
"data": [3, 5, 6]
}
]
}
}
I need to check if any array of key, data is an empty array from series array. So, basically
if any data is empty array from series {
// do something
}
How can I achieve that?

you can try this one
let temp = response.content.series;
let num_of_empty_arr=0;
for(let i=0;i<temp.length;i++){
let obj=temp[i];
if(obj.data.length==0)
num_of_empty_arr++;
}
console.log("totol empty arrays",num_of_empty_arr);

you can do this by looping through response.content.series
for(let i of response.content.series){
if(i.data.length === 0){
//do something
console.log(i.name)
}
}

some allows you to return a boolean (true or false) based on a condition. Use it on the series data and return a value based upon whether the data array has any elements.
let response={meta:{id:781},content:{title:"Test",min:"1",max:"30",series:[{name:"A",data:[]},{name:"B",data:[3,5,6]}]}};
let response2={meta:{id:781},content:{title:"Test",min:"1",max:"30",series:[{name:"A",data:[1,2]},{name:"B",data:[3,5,6]}]}};
function areSomeEmpty(data) {
return data.content.series.some(arr => !arr.data.length);
}
console.log(areSomeEmpty(response));
console.log(areSomeEmpty(response2));

Categorise JSON Data [closed]

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Hey please don't roast me. So i have a JSON data like this
data": {
"person": [
{
"id": "xx1",
"name": "John DOe",
},
],
"person": [
{
"id": "xx2",
"name": "John Snow",
},
],
}
For example, I want to store every person data whose name contains "o". How could I do that? Thank you

JSON object ,if have duplicate keys, it will replace the first one with the most bottom one .
In your sample data, there is two "person" keys. Therefore, at the end, your said data will succumb to this.
{"data":{"person":[{"id":"xx2","name":"John Snow"}]}}
Therefore, to clarify your data, IMHO, this is supposed to be like this in the first place.
"data": {
"person": [
{
"id": "xx1",
"name": "John DOe",
},
{
"id": "xx2",
"name": "John Snow",
},
]
}
Then you can treat data.person as an array and use Array.prototype function to filter out your desired details.
The filter method should be
const personWithNameO = data.person.filter((v) => v.name.includes("o") );
console.log(personWithNameO);

How do I access the component object of the child components I render in a list? [closed]

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I have a JSON payload with a service in my component, but then I'm not sure how would I obtain a reference to the list items component objects from the parent component.

You can do this using ngFor loop.
{
"data": [
{
"id": "4",
"name": " Name1"
},
{
"id": "21",
"name": " Name2"
},
{
"id": "24",
"name": " Name3"
},
{
"id": "11",
"name": " Name4"
}
]
}
In HTML Code
<select>
<option *ngFor="let item of data"
[value]="item.id" >
{{item.name}}
</option>
</select>

How to design nested 3 level json [closed]

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I have an object like below:
Parent: { Child1: [ {name:'grandchild1', value:'abc', checked:true}, {name:'grandchild2', value:'pqr', checked:false} ], Child2: [ {name:'grandchild3', value:'abcd', checked:false}, {name:'grandchild4', value:'pqrs', checked:true} ], parent2{...........}.... };
How can I make it nested JSON.
Just like in root: parent1, parent2...
Child: children1, ....( Corresponding to parent)
Grandchildren: based on children
Please guide me how can I make it?

To make a JSON object you just have to follow JSON syntax
In your example it will look like:
{
"parent": {
"child1": [{
"name": "grandchild1",
"value": "abc",
"checked": "true"
}, {
"name": "grandchild2",
"value": "pqr",
"checked": "false"
}]
}
}
Please note that in JSON, string values must be written with double quotes.
If you need to get JSON string from object programmatically, you can write in javascript:
var myJSON = JSON.stringify(obj);

Meteor: Convert MongoDB server code for client side [closed]

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I can fetch data from meteor mongo terminal using this code but can't fetch data from the client. I know for the client site need different syntax but I am new on this environment. How can I call from a client site? Thanks
db.events.aggregate([
{ "$project": {
"year": { "$year": "$date" },
"month": { "$month": "$date" },
"day": { "$dayOfMonth": "$date" }
}},
{ "$group": {
"_id": null,
"distinctDate": { "$addToSet": { "year": "$year", "month": "$month", "day": "$day" }}
}}
])

Currently Minimongo does not support aggregation.
But you can give a shot to meteorhacks:aggregate
Edit
Usage example:
meteor add meteorhacks:aggregate Then simply use .aggregate function
like below.
var metrics = new Mongo.Collection('metrics');
var pipeline = [
{$group: {_id: null, resTime: {$sum: "$resTime"}}}
];
var result = metrics.aggregate(pipeline);