You can check it against the Object’s keys using Array.some which returns a bool. if(Object.keys(obj).some(function(k){ return ~k.indexOf(“addr”) })){ // it has addr property } You could also use Array.filter and check it’s length. But Array.some is more apt here.
UPDATE for TS4.1+ The original answer still works (and you should read it if you need an explanation), but now that recursive conditional types are supported, we can write merge() with to be variadic: type OptionalPropertyNames<T> = { [K in keyof T]-?: ({} extends { [P in K]: T[K] } ? K : never) }[keyof … Read more
Queue has a constructor that takes in an ICollection. You can pass your list into the queue to initialize it with the same elements: var queue = new Queue<T>(list); // where ‘T’ is the lists data type.
A primitive is a data type that is composed of no other data types and can not be broken down any further. It is like the atoms in the programming scenario. I say atom because atom is a basic unit of matter and there is nothing that can be derived from it. I mean, an … Read more
You want to get list with only name field? If so, then use map (https://kotlinlang.org/api/latest/jvm/stdlib/kotlin.collections/map.html) val names = list.map { it.name }
You need to provide your own implementation of equals() in MyClass. @Override public boolean equals(Object other) { if (!(other instanceof MyClass)) { return false; } MyClass that = (MyClass) other; // Custom equality check here. return this.field1.equals(that.field1) && this.field2.equals(that.field2); } You should also override hashCode() if there’s any chance of your objects being used in … Read more
Delete key-value from object in array, Javascript [duplicate]
Yes, if you called myMethod() 10 times it will create 10 unique and separate objects. The new keyword does exactly what it says on the tin, it creates a brand new object, irrespective of whether one already exists. It creates a new object and stuffs the reference to that object inside the variable it has … Read more
It means that this method can receive more than one Object as a parameter. To better understating check the following example from here: The ellipsis (…) identifies a variable number of arguments, and is demonstrated in the following summation method. static int sum (int … numbers) { int total = 0; for (int i = … Read more