Why we can't access a variable defined in a constructor function. Below is the given condition.
var getEmployee = function(name){
var usrId = 9;
this.name = name;
}
var emp = new getEmployee("Karlie Kloss");
console.log(emp.usrId);
You are trying to access a local variable. Variable has a scope. As you have defined variable in function (using var userId). So its scope has limited to its function. you can't access that variable outside that function.Use this instead of var.
var getEmployee = function(name) {
this.usrId = 9;
this.name = name;
}
var emp = new getEmployee("Karlie Kloss");
console.log(emp.usrId);
You can study about variable scope here:- https://learn.microsoft.com/en-us/scripting/javascript/advanced/variable-scope-javascript
This is because the variable usrIdis declared with var: so it is not "attached" to the object.
To do so, you have to use this instead of var, like this:
var getEmployee = function(name) {
this.usrId = 9;
this.name = name;
}
var emp = new getEmployee("Karlie Kloss");
console.log(emp.usrId);
The keyword var makes the varaible scoped to the parent "top-block" (e.g. function), so it is not visible outside it.
