Exactly like in JavaScript, you can use the parseInt or parseFloat functions, or simply use the unary + operator: All of the mentioned techniques will have correct typing and will correctly parse simple decimal integer strings like “123”, but will behave differently for various other, possibly expected, cases (like “123.45”) and corner cases (like null). Table taken from this answer
You are better off using a native array instead of an object literal with number-like properties, so that numbering (as well as numerous other array functions) are taken care of off-the-shelf. What you are looking for here is an inline interface definition for your array that defines every element in that array, whether initially present or introduced later: If … Read more
The cleaner way would be to not use .forEach. It’s almost never needed if you’re using TypeScript or a modern version of JavaScript: If the code inside your loop doesn’t have any side-effects and you’re just checking for a condition on each item, you could also use a functional approach with .some:
In newer versions of typescript you can use: In older versions you can use: You can also make an interface if you don’t want to type that whole type annotation out every time:
Can someone give a simple definition of what Record is? A Record<K, T> is an object type whose property keys are K and whose property values are T. That is, keyof Record<K, T> is equivalent to K, and Record<K, T>[K] is (basically) equivalent to T. Is Record<K,T> merely a way of saying “all properties on … Read more
RC6/RC7/Final release FIX To fix this error, you just need to import ReactiveFormsModule from @angular/forms in your module. Here’s the example of a basic module with ReactiveFormsModule import: To explain further, formGroup is a selector for directive named FormGroupDirective that is a part of ReactiveFormsModule, hence the need to import it. It is used to … Read more
Currently I have type definition as: I need something like: but the 2nd one is not being accepted.
The Constructor is a default method of the class that is executed when the class is instantiated and ensures proper initialisation of fields in the class and its subclasses. Angular, or better Dependency Injector (DI), analyses the constructor parameters and when it creates a new instance by calling new MyClass() it tries to find providers … Read more
Yes, that’s it. In the app.module.ts file, I just added:
Yes, that’s it. In the app.module.ts file, I just added: