JavaScript operations can fail due to "type errors" when applied to values with the wrong data type. These errors occur due to mistyped variables, implicit type conversions, or older codebases. To fix them, enable strict mode, use console.log() to check variable values, and carefully read error messages.
JavaScript's global null value allows accessing properties on the global object without throwing an error, leading to unexpected behavior if not handled properly. Understanding how it works can help write more robust code by using strict mode, checking for null/undefined, and leveraging optional chaining.
JavaScript's strict mode enhances code quality, security, and performance by enforcing best practices, preventing common mistakes, and catching errors earlier. Adding `'use strict'` to files enables this feature, which can be used globally or within specific sections of code. Strict mode prevents implicit global variables, disallows octal literals, and throws more informative error messages.
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