I am trying to perform a complex deletion in Immutablejs, without, what I always seem to do, converting to JS in the middle of the process.
In the following array, I would like to delete every second {y: } object
series: [
{
name:"1",
data: [
{y: 1},
{y: 2},
{y: 3}
]
},
{
name:"2",
data: [
{y: 1},
{y: 2},
{y: 3}
]
},
{
name:"3",
data: [
{y: 1},
{y: 2},
{y: 3}
]
}
]
So that I would get this :
series: [
{
name:"1",
data: [
{y: 1},
{y: 3}
]
},
{
name:"2",
data: [
{y: 1},
{y: 3}
]
},
{
name:"3",
data: [
{y: 1},
{y: 3}
]
}
]
Can someone point me in the correct direction how to do this with ImmutableJS? If I just use filter or array reduce I can arrive at a really clean solution that looks like this :
series.forEach(function (elem) {
let data = elem.data;
data.splice(index, 1);
});
I am just hoping that immutable has an equally clean looking solution.
The doc for removeIn doesn't go deep enough :
https://facebook.github.io/immutable-js/docs/#/removeIn
You're modifying every element of series so I think you're on the right track with .map(). Then you want to use .removeIn to deeply remove something.
let seriesList = Immutable.fromJS(series)
seriesList = seriesList.map(elem =>
elem.removeIn(['data', indexToRemove]));
// equivalent form with .update() instead of .removeIn()
seriesList = seriesList.map(elem =>
elem.update('data', data => data.remove(indexToRemove)));
I managed to do it using 'map' from Immutable List. This worked for me :
seriesList = Immutable.List(seriesList);
seriesList = seriesList.map(
elem => {
let data = elem.getIn(['data'])
data = data.remove(index)
elem = elem.setIn(['data'], data)
return elem
})
Anyone have something better?
Related
I am having an array of objects as below:
finalList = [
[{name: john}, {name: max}, {name: rob}],
[{id: 1}, {id: 2}, {id: 3}],
[{gender: M}, {gender: F}, {gender: M}],
]
I need the array to transpose like this:
finalList = [
{name: john, id: 1, gender: M},
{name: john, id: 1, gender: M},
{name: john, id: 1, gender: M}
]
The actual array of object is in nested array. Please help me guiding to transpose the array in TypeScript.
Here's a nice functional way. It assumes each array in finalList has the same length and same keys (so no error handling).
const finalList = [
[{name: "john"}, {name: "max"}, {name: "rob"}],
[{id: 1}, {id: 2}, {id: 3}],
[{gender: "M"}, {gender: "F"}, {gender: "M"}],
];
console.log(finalList);
// this is a trick to create an array of a specific size with unique objects inside it
// the fill is necessary to iterate over the holed array (https://stackoverflow.com/q/40297442/2178159)
// fill({}) won't work since it's a single object ref that will be shared
const results = new Array(finalList.length).fill(null).map(() => ({}));
finalList.forEach(group => {
group.forEach((obj, i) => {
Object.assign(results[i], obj);
})
});
console.log(results);
I have a variable here which equates to
var4 = "{name: 'TestUser', data: [1.0, 0.8, 0.64]}"
series: [
{
name: 'TestUser',
data: [1.0, 0.8, 0.64]
}
],
I would like to find out how I can put var4 into my series instead of typing in the data. I have read up about JSON.stringify and parse but it doesn't seem to work here.
Use JSON.parse(str) to turn a string into an object. Also define the JSON variable name as a string.
series = [
{
'name': 'TestUser',
'data': [1.0, 0.8, 0.64]
},
];
series.push(JSON.parse(var4));
Or maybe this is what you want:
myJsonObj = {
'series': [
{
'name': 'TestUser',
'data': [1.0, 0.8, 0.64]
},
]
}
myJsonObj.series.push(JSON.parse(var4));
Or this:
jsonObj = JSON.parse(var4);
myJsonObj = {
'series': [
{
'name': jsonObj.name,
'data': jsonObj.data
},
]
}
I will make Ajax call on my Controller action method. I want result of JSON in this format.
// array of all brands
var brands = [
{ brandId: 1, name: "Ford" },
{ brandId: 2, name: "BMW" }
];
for this i will make another call
// array of all models
var models = [
{ modelId: 1, name: "Explorer", brandId: 1},
{ modelId: 2, name: "Focus", brandId: 1},
{ modelId: 3, name: "X3", brandId: 2},
{ modelId: 4, name: "X5", brandId: 2}
];
How can i do that please guide me.
You can use following code to solve your problem
public ActionResult SomeActionMethod(int id)
{
return Json(new {foo="bar", baz="Blech"});
}
Method from the jquery getJSON method by simply...
$.getJSON("../SomeActionMethod", { id: someId },
function(data) {
alert(data.foo);
alert(data.baz);
}
);
To serialize json in your controller, may be you can use http://www.newtonsoft.com/json/help/html/serializingjson.htm
This question is about Immutable.js library.
I have a List<T>, where T is {name: string, id: number}. I want to convert it to Map<number, T>, with id of T to the keys. Using standard method toMap gives me a Map with sequential indexes, and there is no way to hook there. And no method like indexBy or other. how to do that?
You can do it with a reducer like this:
function indexBy(iterable, searchKey) {
return iterable.reduce(
(lookup, item) => lookup.set(item.get(searchKey), item),
Immutable.Map()
);
}
var things = Immutable.fromJS([
{id: 'id-1', lol: 'abc'},
{id: 'id-2', lol: 'def'},
{id: 'id-3', lol: 'jkl'}
]);
var thingsLookup = indexBy(things, 'id');
thingsLookup.toJS() === {
"id-1": { "id": "id-1", "lol": "abc" },
"id-2": { "id": "id-2", "lol": "def" },
"id-3": { "id": "id-3", "lol": "jkl" }
};
I want to turn json
var treeNodes = [ {managerid:root,Employeeid:01},
{managerid:01,Employeeid:11},
{managerid:01,Employeeid:22},
{managerid:22,Employeeid:33},
{managerid:22,Employeeid:44}
];
into json like this using javascript.
json={
id:root,
children[{
id:01,
children[
{id:11},
{id:22}
]
children[
{id:33},
{id:44}
]
}
Can someone help with java script function?
First of all, your current JSON is incorrect:
var json = {
id: root,
children: [
{
id: 01,
children: [
{id: 11},
{id: 22}
]
},
{
children: [
{id: 33},
{id: 44}
]
}
]
};
Second, could you give more information about your table Employee?