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27 maj 2017 · We could use navigator.userAgent to detect os. // mac os function isMacintosh() { return navigator.userAgent.indexOf("Mac") > -1; } // windows function isWindows() { return navigator.userAgent.indexOf("Win") > -1; }
7 sie 2022 · To alleviate the issue, Object.prototype.hasOwnProperty() can be used in addition to the previous method to check for the property actually being present on the object. Moreover, it can also be used for the opposite, so you can also detect non-existent properties and handle them accordingly.
5 paź 2024 · ESLint is an open source project that helps you find and fix problems with your JavaScript code. It doesn't matter if you're writing JavaScript in the browser or on the server, with or without a framework, ESLint can help your code live its best life.
11 lip 2022 · console.log(myArr[7]); // undefined. In this article, you will learn the various methods and approaches you can use to know if a variable is undefined in JavaScript. This is necessary if you want to avoid your code throwing errors when performing an operation with an undefined variable.
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16 lis 2010 · You can safely use the typeof operator on undefined variables. If it has been assigned any value, including null, typeof will return something other than undefined. typeof always returns a string. Therefore. if (typeof maybeObject != "undefined") { alert("GOT THERE"); }
28 maj 2024 · How to Detect an Undefined Object Property in JavaScript ? Detecting an undefined object property is the process of determining whether an object contains a certain property, and if it does, whether the value of that property is undefined.
