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jsonArray1.js
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71 lines (53 loc) · 2.23 KB
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// database with objects
const database = [
{
username: "john",
password: "123",
},
{
username: "sarah",
password: "456",
},
{
username: "alex",
password: "789",
},
];
console.log("database :", database, " ==>", typeof database);
// access username
let unames = database.map((user) => {
return user.username;
});
console.log("unames :", unames, " ==>", typeof unames);
// convert first letter to uppercase and rest to lowercase
let initnames = unames.map((name) => {
return name.charAt(0).toUpperCase() + name.slice(1).toLowerCase();
});
console.log("init unames :", initnames, " ==>", typeof initnames);
console.log("-------------------------------------------------------------------------------------------");
let keys = Object.keys(database);
console.log("keys :", keys, " ==>", typeof keys);
let values = Object.values(database);
console.log("values :", values, " ==>", typeof values);
let entries = Object.entries(database);
console.log("entries :", entries, " ==>", typeof entries);
console.log("-------------------------------------------------------------------------------------------");
// Iterate using map
Object.keys(database).map((key) => {
console.log(key, ":", database[key]);
});
console.log("-------------------------------------------------------------------------------------------");
// using find - returns object
var isAvail = database.find((user) => {
return user.username === "john" && user.password === "123" ? true : false;
});
console.log("isAvail :", isAvail, " ==>", typeof isAvail);
// using some - returns true or false
var isAvail = database.some((user) => {
return user.username === "john" && user.password === "123" ? true : false;
});
console.log("isAvail :", isAvail, " ==>", typeof isAvail);
console.log("-------------------------------------------------------------------------------------------");
console.log(Object.getOwnPropertyNames(database)); // [ '0', '1', '2', 'length' ]
console.log(Object.hasOwn(database, 0)); // check index of object[json] in above case index are 0,1,2 for true else false
console.log(Object.getOwnPropertyDescriptors(database));