copy object javascript
var x = {key: 'value'}
var y = JSON.parse(JSON.stringify(x))
//this method actually creates a reference-free version of the object, unlike the other methods
//If you do not use Dates, functions, undefined, regExp or Infinity within your objectjavascript subset of object array matching certain property
let cities = [
{name: 'Los Angeles', population: 3792621},
{name: 'New York', population: 8175133},
{name: 'Chicago', population: 2695598},
{name: 'Houston', population: 2099451},
{name: 'Philadelphia', population: 1526006}
];
let bigCities = cities.filter(function (e) { // filter function
return e.population > 3000000;
});
//Output:
[
{ name: 'Los Angeles', population: 3792621 },
{ name: 'New York', population: 8175133 }
]javascript object get subset
const object = { a: 5, b: 6, c: 7 };const subset = (({ a, c }) => ({ a, c }))(object);console.log(subset); // { a: 5, c: 7 }Copyright © 2021 Codeinu
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