The JavaScript engine will throw a ReferenceError. The function is defined as myfunction (all lowercase), but the invocation is myFunction() (with a capital 'F'). JavaScript is a case-sensitive language, meaning myfunction and myFunction are treated as two distinct identifiers. Since no function named myFunction has been defined in the scope, the attempt to call it results in a ReferenceError. The code inside the myfunction block, including the "use strict"; directive, is never executed.

1. Mozilla Developer Network (MDN) Web Docs: In the "JavaScript Guide > Grammar and types" section

it is explicitly stated: "JavaScript is a case-sensitive language. This means that language keywords

variables

function names

and other identifiers must always be typed with a consistent capitalization of letters." (See "Case sensitivity" subsection).

2. ECMA-262

13th Edition (ECMAScript® 2022 Language Specification): Section 6.1.2

"The Undefined Type

" and Section 7.2.2

"IsUnresolvableReference ( V )

" detail the process of reference resolution. An identifier that cannot be resolved in the current lexical environment

such as the call to the non-existent myFunction

results in an unresolvable reference

which leads to a ReferenceError being thrown.

3. Flanagan

D. (2020). JavaScript: The Definitive Guide (7th ed.). O'Reilly Media. Chapter 2

"Lexical Structure

" Section "Case-Sensitivity

" states

"JavaScript is a case-sensitive language. This means that keywords

variables

function names

and other identifiers must always be typed with a consistent capitalization of letters." (p. 16).

4. Haverbeke

M. (2018). Eloquent JavaScript (3rd ed.). No Starch Press. Chapter 2

"Program Structure

" under the section "Bindings

" explains that bindings (variables and functions) have names

and these names are case-sensitive. The text notes

"The names of bindings

also called identifiers

can be any word... Casing matters—catch and Catch are different names." (p. 23).