This question already has answers here:
Closed 10 years ago.
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How to sort an array of javascript objects?
i have a array of objects:
var arr = []
arr[0] = new Object()
...
arr[n] = new Object()
I want to get sorted array by arr[i].getSortOrder() for example, where arr[i].getSortOrder() return integer value. How to do it ?
Just for the record:
arr.sort(function(a, b){return a.getSortOrder() - b.getSortOrder();});
For details see Sorting an array of JavaScript objects and the MDN docs for the sort() method.
Related
This question already has answers here:
JavaScript flattening an array of arrays of objects
(14 answers)
Closed 4 months ago.
I'm working with an API and after I try to clean up the data, I got an array of arrays of arrays:
arr = [[[{name: "john"}],[{name: "jack"}]],[[{name: "joe"}],[{name: "bob"}]]]
How can I clean this up to something like this:
arr = [{name: "john"},{name: "jack"},{name: "joe"},{name: "bob"}]
You can use Array.prototype.flat(), providing Infinity as the depth argument to flatten all sub-arrays recursively:
const arr = [[[{name: "john"}],[{name: "jack"}]],[[{name: "joe"}],[{name: "bob"}]]];
const flattened = arr.flat(Infinity);
console.log(flattened);
In this case calling arr.flat().flat() would do the trick.
This question already has answers here:
Does JavaScript guarantee object property order?
(13 answers)
Does ES6 introduce a well-defined order of enumeration for object properties?
(3 answers)
Closed 1 year ago.
I'm trying to sort an object from db
MyOjbect : {
key: {
val1:"value",
val2:"",
val3:time,
val4:...
...}
}
and I sorted the object by val3
const sorted = Object.entries(MyObject)
.sort((x,y) => {x[1].val3 - y[1].val3} );
and got an array type.
0:(2) ["key" , {val1:...val2:...}]
1:(2) ["key" , {val1:...val2:...}]
...
I tried reduce() to make it back to the object type, but it changes to be in unsorted order
How can I keep the order sorted and change the type to the object?
You can't. An object doesn't keep the sort order as an Array does it. If you want to have the keys sorted you need to use an Array.
This question already has answers here:
How to map more than one property from an array of objects [duplicate]
(7 answers)
Closed 2 years ago.
I have an array of objects like this:
var array = [{date:'01/01/2017',value1:200,value2:300,value3:400}, {date:'02/01/2017',value1:220,value2:330,value3:430},{date:'03/01/2017',value1:250,value2:330,value3:420}]
I am trying to get the subset of the array objects like below in Javascript: I also need to add a 10 to value2.
var arrayOne = [{date:'01/01/2017',value2:300}, {date:'02/01/2017',value2:330},{date:'03/01/2017',value2:330}]
Any suggestions would be greatly appreciated.
You could use map to iterate and select
var array = [{date:'01/01/2017',value1:200,value2:300,value3:400}, {date:'02/01/2017',value1:220,value2:330,value3:430},{date:'03/01/2017',value1:250,value2:330,value3:420}]
console.log(array.map(({ date, value2 }) => ({ date, value2: value2 + 10 })))
This question already has answers here:
Sort array of objects by string property value
(57 answers)
Closed 8 years ago.
I have an array of objects, and i am basically breaking my head on sorting it,my array is something like dis :
var myArray = [{1:3},{3:19},{5:53},{6:26},{e:53},{c:107},{B: 2},{f: 5}];
But i have to sort this in such a way that my final output is something like this:
myArray = [{c:107},{5:53},{e:53},{6:26},{3:19},{f: 5},{1:3},{B: 2}];
i.e.; based on the value in each object of array element, the array should sorted in descending order.
Thank you in advance.
You can simply use a comparator function in Array.prototype.sort like this
console.log(myArray.sort(function(first, second) {
return second[Object.keys(second)[0]] - first[Object.keys(first)[0]];
}));
Since the key will be different in every object, we get the actual list of keys and taking only the first item in it.
This question already has answers here:
Sorting object property by values
(44 answers)
Closed 9 years ago.
I have an object like this :
{tsg2b: 1, fjdlf: 0}
Now i need to sort this object based on the value for example i need the result something like this :
{fjdlf: 0,tsg2b: 1}
You have to take the object into an array and then sort the array because object cannot be sorted in java script. try the following --
var test = {tsg2b: 1, fjdlf: 0}
var sortable = [];
for (var item in test)
sortable.push([item, test[item]])
sortable.sort(function(a, b) {return a[1] - b[1]})