tl;dr In ECMAScript 2017, just call Object.entries(yourObj). In ECMAScript 2015, it is possible with Maps. In ECMAScript 5, it is not possible. ECMAScript 2017 ECMAScript 2017 introduced a new Object.entries function. You can use this to iterate the object as you wanted. ‘use strict’; const object = {‘a’: 1, ‘b’: 2, ‘c’ : 3}; for … Read more
As in latest release of Angular (v6.1.0) , Angular Team has added new built in pipe for the same named as keyvalue pipe to help you iterate through objects, maps, and arrays, in the common module of angular package. For example – <div *ngFor=”let item of testObject | keyvalue”> Key: <b>{{item.key}}</b> and Value: <b>{{item.value}}</b> </div> … Read more
Use usort, here’s an example adapted from the manual: function cmp($a, $b) { return strcmp($a->name, $b->name); } usort($your_data, “cmp”); You can also use any callable as the second argument. Here are some examples: Using anonymous functions (from PHP 5.3) usort($your_data, function($a, $b) {return strcmp($a->name, $b->name);}); From inside a class usort($your_data, array($this, “cmp”)); // “cmp” should … Read more
Here, i’m creating instance of my class No, you are not creating the instance of your abstract class here. Rather you are creating an instance of an anonymous subclass of your abstract class. And then you are invoking the method on your abstract class reference pointing to subclass object. This behaviour is clearly listed in … Read more
Right-click an object in Chrome’s console and select Store as Global Variable from the context menu. It will return something like temp1 as the variable name. Chrome also has a copy() method, so copy(temp1) in the console should copy that object to your clipboard. Note on Recursive Objects: If you’re trying to copy a recursive … Read more
function getKeyByValue(object, value) { return Object.keys(object).find(key => object[key] === value); } ES6, no prototype mutations or external libraries. Example, function getKeyByValue(object, value) { return Object.keys(object).find(key => object[key] === value); } const map = {“first” : “1”, “second” : “2”}; console.log(getKeyByValue(map,”2″));
Update: In Python 2.6 and onwards, consider whether the namedtuple data structure suits your needs: >>> from collections import namedtuple >>> MyStruct = namedtuple(‘MyStruct’, ‘a b d’) >>> s = MyStruct(a=1, b={‘c’: 2}, d=[‘hi’]) >>> s MyStruct(a=1, b={‘c’: 2}, d=[‘hi’]) >>> s.a 1 >>> s.b {‘c’: 2} >>> s.c Traceback (most recent call last): File … Read more
Iterator objects in python conform to the iterator protocol, which basically means they provide two methods: __iter__() and __next__(). The __iter__ returns the iterator object and is implicitly called at the start of loops. The __next__() method returns the next value and is implicitly called at each loop increment. This method raises a StopIteration exception … Read more
Using Object Destructuring and Property Shorthand const object = { a: 5, b: 6, c: 7 }; const picked = (({ a, c }) => ({ a, c }))(object); console.log(picked); // { a: 5, c: 7 } From Philipp Kewisch: This is really just an anonymous function being called instantly. All of this can be … Read more
The first is used to initialise newly created object, and receives arguments used to do that: class Foo: def __init__(self, a, b, c): # … x = Foo(1, 2, 3) # __init__ The second implements function call operator. class Foo: def __call__(self, a, b, c): # … x = Foo() x(1, 2, 3) # __call__