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TypeScript - remove function from object
0 points
In TypeScript, you shouldn't remove existing functions from objects as this can lead to errors.
Such things can be solved by deleting the object to a different type (e.g. omitting a property) or creating a new object that does not contain the method that we want to omit.
Example 1
xxxxxxxxxx1
interface Student {2
name: string;3
print(): void;4
}5
6
const studentObject: Student = {7
name: 'John',8
print: function () {9
console.log('text...');10
},11
};12
13
// create new type that has no print method14
type Student2 = Omit<Student, 'print'>;15
16
// create reference to Student object omitting print method17
const studentObject2 = studentObject as Student2;Example 2
xxxxxxxxxx1
interface Student {2
name: string;3
print(): void;4
}5
6
const student: Student = {7
name: 'John',8
print: function () {9
console.log('text...');10
},11
};12
13
// create reference to Student object omitting print method14
const student2 = student as Omit<Student, 'print'>;Note:
student2containsprint()method, but the type it was cast to does not.
Example 3
xxxxxxxxxx1
interface Student {2
name: string;3
print(): void;4
}5
6
const student: Student = {7
name: 'John',8
print: function () {9
console.log('text...');10
},11
};12
13
class StudentData {14
public name: string;15
16
constructor(student: Student) {17
this.name = student.name;18
}19
}20
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const student3 = new StudentData(student);xxxxxxxxxx1
interface Student {2
name: string;3
print(): void;4
}5
6
const student: Student = {7
name: 'John',8
print: function () {9
console.log('text...');10
},11
};12
13
class StudentData {14
constructor(public name: string, public age: number) {}15
}16
17
const student4 = new StudentData('John', 22);