Why won't Javascript inherit the properties from a prototype
Example
function Man(name,age,color){
this.name = name;
this.age = age;
this.color = color;
}
boy = function Boy(){};
boy.prototype = new Man();
myboy = new boy('hari',14,'blue');
console.log(myboy);
// => myboy {name:undefined, age:undefined, color:undefined}
It does not inherit the properties.
Its meant to have the properties
// => myboy {name:'hari', age:14, color:'blue'}
It does not inherit the properties.
Yes it does, it clearly has name, age and color. They just don't have any values because you are calling Man without any arguments, and Boy doesn't do anything with the arguments you provided.
Your inheritance setup is simply incorrect. You should add the parent prototype to the prototype chain of the child using Object.create:
Boy.prototype = Object.create(
Man.prototype,
{constructor: {value: Boy, writable: true}}
);
And, like in other languages, you have to call the parent constructor inside the child constructor (applied to the new child instance), passing along all the needed argumants:
function Boy(name, age, color) {
Man.call(this, name, age, color);
}
// or
function Boy() {
Man.apply(this, arguments);
}
More info:
name,ageandcolor. They just don't have any values because you are callingManwithout any arguments, andBoydoesn't do anything with the arguments you provided.Boydoesn't do anything with the arguments you provided." The function is empty.