CODEWITHSUNDEEP
javascript
Cazineer
Cazineer

Reputation: 2405

Assign an imported function as a class method?

Is it possible to assign an imported function as a class method, so that it automatically goes on an objects prototype chain?

// Module
module.exports = function testMethod() {
    console.log('From test method')
}

// Main
const testMethod = require('./testMethod')

class TestClass {
    // Replace this method with imported function
    testMethod() {
        console.log('From test method')
    }
}

const obj = new TestClass()

I was able to attach the method in this constructor using this.testMethod = testMethod but the method did not go on an objects prototype chain.

Upvotes: 1

Views: 298

Answers (1)

CertainPerformance
CertainPerformance

Reputation: 370679

Assign to the .prototype property of the TestClass so that instances of TestClass will see the imported method:

class TestClass {
}
TestClass.prototype.testMethod = testMethod;


const testMethod = () => console.log('test method');

class TestClass {
}
TestClass.prototype.testMethod = testMethod;

const tc = new TestClass();
tc.testMethod();

Upvotes: 4

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