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let dog = { dogName: "JavaScript", weight: 2.4, color: "brown", breed: "chihuahua", burglarBiter: true }; Thêm thuộc tính age có giá trị là 3 cho đối tượng dog let variable = "age"; dog[variable] = 3; let variable = "age"; dog.variable = 3; dog['age']=3 dog.age=3

Question

let dog = { dogName: "JavaScript", weight: 2.4, color: "brown", breed: "chihuahua", burglarBiter: true }; Thêm thuộc tính age có giá trị là 3 cho đối tượng dog let variable = "age"; dog[variable] = 3; let variable = "age"; dog.variable = 3; dog['age']=3 dog.age=3

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Solution

All of the above methods can be used to add a new property to an object in JavaScript. Here's how each one works:

  1. let variable = "age"; dog[variable] = 3; - This method uses a variable to define the property name. The value of the variable "age" is added to the dog object as a property, and it's set to 3.

  2. let variable = "age"; dog.variable = 3; - This method will not work because it's trying to add a property named "variable" to the dog object, not "age".

  3. dog['age']=3 - This method directly adds a property named "age" to the dog object and sets it to 3.

  4. dog.age=3 - This method also directly adds a property named "age" to the dog object and sets it to 3.

So, the correct ways to add the property "age" with a value of 3 to the dog object are the 1st, 3rd, and 4th methods. The 2nd method is incorrect.

This problem has been solved

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