check if property exist inside List of objects-CodePudding

I have list of objects response.tasks: {userLastName: ', srCreationDate: '', idNumber: '', firstName: ', insStartDate: null, …} and I want to know if I have some properties for userLastName it will be true for 'example' will be false. I need to write this condition via html

I tried 'userLastName' in response.tasks

response.tasks.hasOwnProperty('userLastName')

response.tasks.includes('userLastName')`

but all of them were false

CodePudding user response：

You have an array (multiple items) so you need to check if "some" item has the property

response.tasks.some(task => task.hasOwnProperty('userLastName'))

or "every" item has the property

response.tasks.every(task => task.hasOwnProperty('userLastName'))

depending on your requirements

CodePudding user response：

You can use in operator.

The in operator returns true if the specified property is in the specified object or its prototype chain.

Example:

interface I1 {
    userLastName: string
}


let myVar: I1 = {
    userLastName: 'test'
}

console.log('userLastName' in myVar); // returns true