Run results for: Accessing Property of Object Directly vs. Defensively

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/89.0.4389.114 Safari/537.36 Edg/89.0.774.76

Browser: Chrome 89

Operating system: Windows

Device Platform: Desktop

Date tested: 3 years ago

Test name	Executions per second
Direct Access	6812444.0 Ops/sec
Defensive Check for Existence via If-statement	1810216.4 Ops/sec
Defensive Check for Existence via If-statement using `hasOwnProperty`	820497.7 Ops/sec
Defensive Check for Existence via Chaining	2476567.2 Ops/sec
Defensive Check for Existence via Chaining using `hasOwnProperty`	937536.9 Ops/sec

Script Preparation code:

var response = {
  data: {
    property: "value",
  },
};

Tests:

Direct Access
function directAccess () { return response.data.property; } directAccess();
Defensive Check for Existence via If-statement
function defensiveCheckForExistenceViaIfStatement () { if (response && response.data && response.data.property) { return response.data.property; } } defensiveCheckForExistenceViaIfStatement();
Defensive Check for Existence via If-statement using `hasOwnProperty`
function defensiveCheckForExistenceViaIfStatementUsingHasOwnProperty () { if (response && Object.prototype.hasOwnProperty.call(response, 'data') && Object.prototype.hasOwnProperty.call(response.data, 'property') ) { return response.data.property; } } defensiveCheckForExistenceViaIfStatementUsingHasOwnProperty();
Defensive Check for Existence via Chaining
function defensiveCheckForExistenceViaChaining () { return response && response.data && response.data.property; } defensiveCheckForExistenceViaChaining();
Defensive Check for Existence via Chaining using `hasOwnProperty`
function defensiveCheckForExistenceViaChainingUsingHasOwnProperty () { return ( response && Object.prototype.hasOwnProperty.call(response, 'data') && Object.prototype.hasOwnProperty.call(response.data, 'property') ); } defensiveCheckForExistenceViaChainingUsingHasOwnProperty();