React Native/Javascript - How to know that object does not have the property?

user_9048977 0
Viewed 377

Let say :

myVariable.color;
myVariable.height;
myVariable.width;

But sometimes, myVariable only have "color" and "height" property.

I have try this, but no luck :

if(myVariable.width == undefined) {
//but not filtered here
}

How to know if myVariable doesn't contain "width" property by code, is it possible ?

react-native javascript
2 Answers

You could try to double negate:

if(!!myVariable.width){
    //do something here
}
user_2047010

You are looking for hasOwnProperty.

If you would like to perform a search in the whole potential prototype chain of an object, you can also use the in operator.

if (width in object) {
user_93533870
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