What is JavaScript's strict mode and how does it affect compatibility?
An example of an AI chatbot conversation about JavaScript's strict mode and its compatibility issues.
What is JavaScript's strict mode and how does it affect compatibility?
JavaScript's strict mode is a way to opt in to a restricted variant of JavaScript, which helps catch common coding errors and 'unsafe' actions. It can affect compatibility by disallowing certain features that may be present in non-strict mode.
Can you give me examples of features that are disallowed in strict mode?
Sure! In strict mode, you can't use undeclared variables, delete variables or functions, or use duplicate parameter names in function declarations.
Does strict mode affect older browsers?
Yes, strict mode is not supported in older browsers like Internet Explorer 9 and below. It's best to check compatibility if you're targeting those browsers.
How can I enable strict mode in my JavaScript code?
You can enable strict mode by adding the string 'use strict'; at the beginning of your JavaScript file or function.
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