how to check if object has key javascript
myObj.hasOwnProperty('key') // it checks object for particular key and not on prototypehow to check if object has key javascript
myObj.hasOwnProperty('key') // it checks object for particular key and not on prototypejavascript for key in object
// iterates over all enumerable properties of an object that are
// keyed by strings (ignoring ones keyed by Symbols),
// including inherited enumerable properties.
const object = { a: 1, b: 2, c: 3 };
for (const property in object) {
console.log(`${property}: ${object[property]}`);
}
// expected output:
// "a: 1"
// "b: 2"
// "c: 3"object keys javascript
const object1 = {
a: 'somestring',
b: 42,
c: false
};
console.log(Object.keys(object1));
// expected output: Array ["a", "b", "c"]typescript check if object has key
if ('key' in myObj)js object keys
var myObj = {no:'u',my:'sql'}
var keys = Object.keys(myObj);//returnes the array ['no','my'];js create object with keys
var users = [{userId: "1", name: 'harald'}, {userId: "2", name: 'jamie'}];
var obj = {};
users.forEach(user => {
obj = {
...obj,
[user.userId]: user,
}
})
console.log(obj)
// {
// 1: {userId: "1", name: "harald"}
// 2: {userId: "2", name: "jamie"}
// }Copyright © 2021 Codeinu
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