How do you prevent creating a global variable when mistyping a variable name?

The correct choice, which is to use 'use strict', is a statement in JavaScript that enables strict mode. When strict mode is enabled, it helps catch common coding errors such as the accidental creation of global variables.

In traditional JavaScript, if you mistype a variable name (for example, typing myVar instead of myVar1), without strict mode enabled, the interpreter will create a global variable with the incorrect name, which can lead to difficult-to-debug issues in your code. However, when you include 'use strict' at the beginning of your script or function, the code will throw an error if you try to assign a value to an undeclared variable. This behavior helps enforce better coding practices and reduces the chance of silent failures due to typos.

Using 'let' and 'const' are also ways to declare variables, but they do not inherently prevent the creation of global variables from typos unless combined with strict mode. Both options impose block scope and avoid hoisting, but strict mode specifically targets the misuse of variable declarations. As for 'var', it declares variables that are function-scoped or globally scoped, which doesn’t help prevent global variable issues when a variable is mistyped.

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