To validate any object, ensure that it contains a specific key before retrieving the corresponding value in typescript

When looking at a random object, my goal is to verify that it follows a certain structure.

obj = {WHERE:{antherObject},OPTIONS{anotherObject}}

Once I confirm the object has the key using hasProperty(key), how can I retrieve the value of the key?

I thought about implementing something like this.

validateForm(obj: Object):Object { 

if obj.hasOwnProperty("WHERE") {
//return the value of "WHERE"
}
else{
throw new Error("WHERE isnt a key in this object");}

Answer №1

When it comes to javascript (and typescript), there are a couple of approaches for accessing object properties:

  1. Utilizing dot notation, such as obj.WHERE
  2. Employing bracket notation, like obj['WHERE']

The preferred method is typically using dot notation if you already know the specific key you're searching for. On the other hand, you'll need to leverage bracket notation when dealing with a variable or dynamically generated value as the key.

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