predicate

This question already has an answer here: Predicate Delegates in C# 9 answers I am very new to using predicates and just learned how to write: Predicate<int> pre = delegate(int a){ a %2 == 0 }; What will the predicate return, and how is it useful when programming? Predicate<T> is a functional construct providing a convenient way of basically testing if something is true of a given T object. For example suppose I have a class: class Person { public string Name { get; set; } public int Age { get; set; } } Now let's say I have a List<Person> people and I want to know if there's anyone named Oscar

I'm trying to make Selenium wait for an element that is dynamically added to the DOM after page load. Tried this: fluentWait.until(ExpectedConditions.presenceOfElement(By.id("elementId")); In case it helps, here is fluentWait : FluentWait fluentWait = new FluentWait<>(webDriver) { .withTimeout(30, TimeUnit.SECONDS) .pollingEvery(200, TimeUnit.MILLISECONDS); } But it throws a NoSuchElementException - looks like presenceOfElement expects the element to be there so this is flawed. This must be bread and butter to Selenium and don't want to reinvent the wheel... could anyone suggest an alternative

Can you explain to me: What is a Predicate Delegate? Where should we use predicates? Any best practices when using predicates? Descriptive source code will be appreciated. A predicate is a function that returns true or false . A predicate delegate is a reference to a predicate. So basically a predicate delegate is a reference to a function that returns true or false . Predicates are very useful for filtering a list of values - here is an example. using System; using System.Collections.Generic; class Program { static void Main() { List<int> list = new List<int> { 1, 2, 3 }; Predicate<int>