const obj1 = { name: "kim", age: 14 };
const obj2 = { name: "Steve", age: 20};
const arr = [ obj1, obj2];
arr[0]["name"].includes("han"); // true
so this is the code that I am curious.
I think includes() method is for array, not for object.
but in this case arr is array but arr[0] is object. also arr[0]["name"] is property of object, then why is it possible to use includes method on this code?
I would be grateful if someone tell me what I know wrong
You can use includes on Arrays or on strings.
According to you code includes doesn't give true because It doesn't work on an object. Instead, you are using it on a string.
When you console
arr[0]["name"] // kim
And what your code is checking is whether han is a substring of kim or not. As we know it's not so it will output false
const obj1 = { name: "kim", age: 14 };
const obj2 = { name: "Steve", age: 20 };
const arr = [obj1, obj2];
console.log(arr[0]["name"]);
console.log(arr[0]["name"].includes("m"));includes() check if a sub string is present in the given string.
In your case :
arr[0]["name"].includes("han")
It should return false, as "kim" does not include "han".
true. Instead, it should givefalse. BTW you are usingincludeson a string, not on object. if you would have used any substring fromkimthen you would have gottruearr[0]["name"](orarr[0].name, same thing) is a string. See String.prototype.includes()