l know my question is similar for too many questions. l have checked all answers and all answers are not give me what l want exactly.
l have this array :
[
{
"size": true,
"status": true,
"desc": "صحن مخلمة",
"name": "مخلمة",
"id": "QmzeJgg2F2"
}
]
l want to push new array object by index array above using this code :
items_local: any[] = [];
add_addons(index,data) {
this.items_local[index].addons.push(data.addons);
console.log(this.items_local);
}
expected output :
[
{
"addons": [ // new array pushing
{
"price": 10
},
{
"price": 10
}
],
"size": true,
"status": true,
"desc": "صحن مخلمة",
"name": "مخلمة",
"id": "QmzeJgg2F2"
}
]
Error :
ERROR TypeError: Cannot read property 'push' of undefined
your original object doesn't have a addons key, hence you can't call the push property on it, first create that key and assign to empty array
add_addons(index,data) {
this.items_local[index].addons = []
this.items_local[index].addons.push(data.addons);
console.log(this.items_local);
}
Related
This question already has answers here:
Find object by id in an array of JavaScript objects
(36 answers)
Closed 5 months ago.
I have this data (data1) below, an array of objects with multiple objects inside:
[
{
"id": 35,
"code": "BP S",
"article": "BP S",
"price": 100,
"vat": null,
"status": null,
"company_id": 12
},
{
"id": 36,
"code": "B P S",
"article": "BPS",
"price": 100,
"vat": null,
"status": null,
"company_id": 12
}
]
I would like to extract the code of the first id=35.
How to do that?
My code:
import { useLocation } from "react-router-dom";
const Single = ({ inputs, title }) => {
const { state } = useLocation();
let data1 = state.foo;
console.log(data1);
You could use the High order function find to retrieve the item of the array matching the id = 35 , as in:
const item = data1.find((el)=>el.id===35)
Then you could extract the code with:
item.code
Or you could chain them:
const code = data1.find((el)=>el.id===35).code
I got JSON data, like:
{
"id": 1,
"active": true,
"dependency": [
{ "id": 2 }
{ "id": 3 }
]
},
{
"id": 2,
"active": true
},
{
"id": 3,
"active": true
}
I want to retrieve the "active" value for each dependency in the id 1 object. So far I used a forEach to get those dependency.
thisElement.dependency.forEach(function(id) {
console.log(id)
}
Which returns id 2 and id 3 as objects. Is there a way to use id.active straight away? By using only one loop? Because the result so far are objects without any connection to the related JSON data. Would it require to loop through the whole JSON data to retrieve those values?
The most efficient thing to to is create a hashmap with an Object or Map first so you only need to iterate the array once to find dependency related values.
You could do it by using Array#find() to search whole array each time but that is far more time complexity than the o(1) object lookup
const activeMap = new Map(data.map(obj => [obj.id, obj.active]))
data[0].dependency.forEach(({id}) => console.log(id ,' active: ' , activeMap.get(id)))
<script>
const data =
[
{
"id": 1,
"active": true,
"dependency": [
{"id": 2 },
{"id": 3}
]
},
{
"id": 2,
"active": false
},
{
"id": 3,
"active": true
}
]
</script>
This question already has answers here:
How to count duplicate value in an array in javascript
(35 answers)
Closed 5 years ago.
I have a JSON file. I want to find the length of the JSON object where one key-value pair is similar. Like,
https://api.myjson.com/bins/h5mgv
[
{
"receive_date": "2013-11-04",
"responses": "2",
"name": "west"
},
{
"receive_date": "2013-11-04",
"responses": "8668",
"name": "west"
},
{
"receive_date": "2013-11-13",
"responses": "121",
"name": "east"
}
]
In the above example, length is 2 where "name": "west" and length is 1 where "name": "east" . I want to iterate through the JSON and find the identical values for the key name using Javascript. Output should look like,
east : 1
west : 2
By using length() I can find the length of whole JSON but what is recommended way to find the length for identical key values.
You can use reduce to get a new object listing the count of each name:
const myArray = [
{
"receive_date": "2013-11-04",
"responses": "2",
"name": "west"
},
{
"receive_date": "2013-11-04",
"responses": "8668",
"name": "west"
},
{
"receive_date": "2013-11-13",
"responses": "121",
"name": "east"
}
]
const myCounts = myArray.reduce((counts, item) => {
if (counts[item.name] === undefined) counts[item.name] = 0;
counts[item.name]++;
return counts;
}, {});
console.log(myCounts);
This produces the result:
{
"west": 2,
"east": 1
}
I'm asking here as I can see this website the most one can help in this
I have an output value in JASON format as the following:
{
"total": 16,
"members": [{
"id": 4,
"name": "Blade11",
"descriptors": {
"os": "Windows 2012 / WS2012 R2"
},
"FCPaths": [{
"wwn": "50060B0000C27208",
"hostSpeed": 0
}, {
"wwn": "50060B0000C2720A",
"hostSpeed": 0
}],
"iSCSIPaths": [],
"persona": 11,
"links": [{
"href": "https://3par:8080/api/v1/hostpersonas?query=\"wsapiAssignedId EQ 11\"",
"rel": "personaInfo"
}],
"initiatorChapEnabled": false,
"targetChapEnabled": false
}, {
"id": 6,
"name": "Blade4",
"descriptors": {
"os": "VMware (ESXi)"
},
"FCPaths": [{
"wwn": "50060B0000C27216",
"hostSpeed": 0
}, {
"wwn": "50060B0000C27214",
"hostSpeed": 0
}],
"iSCSIPaths": [],
"persona": 8,
"links": [{
"href": "https://3par:8080/api/v1/hostpersonas?query=\"wsapiAssignedId EQ 8\"",
"rel": "personaInfo"
}],
"initiatorChapEnabled": false,
"targetChapEnabled": false
}
what I want is, to parse this output for retrieving an output parameter with the name object only in a list or array of string
for example Names = Blade11, Blade4,....
if you can see in the Json output we have all the names under "members", then each one is another array of values, I want to retrieve only names
thanks
If this JSON is string first you have to parse it
var json = JSON.parse('here is your JSON string');
Than you can access to it properties like you work with object
var names = json.members.map(function(member) {
return member.name;
});
Since you already have JSON format, you can use an array method on the member key of your JSON object to iterate through each array item.
var names = [];
object_name.members.forEach((arrItem) => {
names.push(arrItem.name);
}
or
namesArray = object_name.members.map((arrItem) => {
return arrItem.name;
}
You could use Array#map for iterating all elements of the array and return only the name property.
If you have a JSON string, you need to parse it in advance for getting an object, like
object = JSON.parse(jsonString);
var jsonString = '{"total":16,"members":[{"id":4,"name":"Blade11","descriptors":{"os":"Windows 2012 / WS2012 R2"},"FCPaths":[{"wwn":"50060B0000C27208","hostSpeed":0},{"wwn":"50060B0000C2720A","hostSpeed":0}],"iSCSIPaths":[],"persona":11,"links":[{"href":"https://3par:8080/api/v1/hostpersonas?query=\\"wsapiAssignedId EQ 11\\"","rel":"personaInfo"}],"initiatorChapEnabled":false,"targetChapEnabled":false},{"id":6,"name":"Blade4","descriptors":{"os":"VMware (ESXi)"},"FCPaths":[{"wwn":"50060B0000C27216","hostSpeed":0},{"wwn":"50060B0000C27214","hostSpeed":0}],"iSCSIPaths":[],"persona":8,"links":[{"href":"https://3par:8080/api/v1/hostpersonas?query=\\"wsapiAssignedId EQ 8\\"","rel":"personaInfo"}],"initiatorChapEnabled":false,"targetChapEnabled":false}]}',
object = JSON.parse(jsonString),
array = object.members.map(function (a) { return a.name; });
console.log(array);
I'm creating a JSON object from an array and I want to dynamically push data to this JSON object based on the values from array. See my code for a better understanding of my problem...
for(i=0;i<duplicates.length; i++) {
var request = {
"name": duplicates[i].scope,
"id": 3,
"rules":[
{
"name": duplicates[i].scope + " " + "OP SDR Sync",
"tags": [
{
"tagId": 1,
"variables":[
{
"variable": duplicates[i].variable[j],
"matchType": "Regex",
"value": duplicates[i].scopeDef
}
],
"condition": false,
},
{
"tagId": 1,
"condition": false,
}
],
"ruleSetId": 3,
}
]
}
}
I take object properties from the duplicates array that can have the following elements:
[{scopeDef=.*, scope=Global, variable=[trackingcode, v1, v2]}, {scopeDef=^https?://([^/:\?]*\.)?delta.com/products, scope=Products Section, variable=[v3]}]
As you can see, an object contain variable element that can have multiple values. I need to push to the JSON object all those values dynamically (meaning that there could be more than 3 values in an array).
For example, after I push all the values from the duplicates array, my JSON object should look like this:
name=Products Section,
rules=
[
{
name=Products Section OP SDR Sync,
tags=[
{
variables=
[
{
matchType=Regex,
variable=v3,
value=^https?://([^/:\?]*\.)?delta.com/products
},
{
matchType=Regex,
variable=trackingcode,
value=.*
},
{
matchType=Regex,
variable=v1,
value=.*
},
{
matchType=Regex,
variable=v2,
value=.*
}
],
condition=false,
},
{
condition=false,
tagId=1
}
],
ruleSetId=3
}
]
}
I tried the following code but without success:
for(var j in duplicates[i].variable) {
var append = JSON.parse(request);
append['variables'].push({
"variable":duplicates[i].variable[j],
"matchType": "Regex",
"value": duplicates[i].scopeDef
})
}
Please let me know if I need to provide additional information, I just started working with JSON objects.
First of all, you dont need to parse request, you already create an object, parse only when you get JSON as string, like:
var json='{"a":"1", "b":"2"}';
var x = JSON.parse(json);
Next, you have any property of object wrapped in arrays. To correctly work with it you should write:
request.rules[0].tags[0].variables.push({
"variable":duplicates[i].variable[j],
"matchType": "Regex",
"value": duplicates[i].scopeDef
})
If you want to use your code snippet, you need some changes in request:
var request = {
"name": duplicates[i].scope,
"id": 3,
"variables":[
{
"variable": duplicates[i].variable[j],
"matchType": "Regex",
"value": duplicates[i].scopeDef
}
],
"rules":[
{
"name": duplicates[i].scope + " " + "OP SDR Sync",
"tags": [
{
"tagId": 1,
"condition": false,
},
{
"tagId": 1,
"condition": false,
}
],
"ruleSetId": 3,
}
]
}
}
To understand JSON remember basic rule: read JSON backward. It means:
property
object.property
arrayOfObfects['id'].object.property
mainObject.arrayOfObfects['id'].object.property
and so on. Good luck!