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Questions and Answers
Which statement accurately describes the primary benefit of using functions in programming?
Which statement accurately describes the primary benefit of using functions in programming?
- Functions automatically optimize the code for faster execution.
- Functions allow code to be reused in different parts of a program, reducing redundancy. (correct)
- Functions inherently improve the visual appearance of the user interface.
- Functions enable the use of global variables, making them accessible throughout the entire script.
What is the correct syntax for declaring a function named calculateSum that accepts two parameters, a and b?
What is the correct syntax for declaring a function named calculateSum that accepts two parameters, a and b?
- `calculateSum = function(a, b) { return a + b; }`
- `function calculateSum(a, b) { return a + b; }` (correct)
- `calculateSum(a, b) function { return a + b; }`
- `function calculateSum(a, b) => { return a + b; }`
In the context of the provided content, what does the term 'function body' refer to?
In the context of the provided content, what does the term 'function body' refer to?
- The name given to a function when it is declared, used for calling it later.
- The block of code enclosed in curly braces `{}` that defines the actions the function performs. (correct)
- The list of parameters that a function accepts, enclosed in parentheses.
- The keyword used to define a function.
What will be the output of the following code snippet?
`function modifyValue(x) {
x = x + 10;
return x;
}
let y = 5;
modifyValue(y);
console.log(y);`
What will be the output of the following code snippet?
`function modifyValue(x) { x = x + 10; return x; }
let y = 5; modifyValue(y); console.log(y);`
Consider the following code:
`function outerFunction() {
let outerVar = 'Hello';
function innerFunction() {
let innerVar = 'World';
console.log(outerVar + ' ' + innerVar);
}
innerFunction();
}
outerFunction();`
What will be the output to the console?
Consider the following code:
`function outerFunction() { let outerVar = 'Hello';
function innerFunction() { let innerVar = 'World'; console.log(outerVar + ' ' + innerVar); }
innerFunction(); }
outerFunction();`
What will be the output to the console?
If a variable is declared inside a function, what is its scope?
If a variable is declared inside a function, what is its scope?
Analyze the following code snippet and determine the final output:
`let globalVar = 10;
function modifyGlobal() {
globalVar = 20;
}
function localScope() {
let globalVar = 5;
modifyGlobal();
console.log(globalVar);
}
localScope();
console.log(globalVar);`
Analyze the following code snippet and determine the final output:
`let globalVar = 10;
function modifyGlobal() { globalVar = 20; }
function localScope() { let globalVar = 5; modifyGlobal(); console.log(globalVar); }
localScope(); console.log(globalVar);`
What is the significance of parameters in a function declaration?
What is the significance of parameters in a function declaration?
Examine the code below. What is the result of calling console.log(add(5)(3))?
function add(x) { return function(y) { return x + y; } }
Examine the code below. What is the result of calling console.log(add(5)(3))?
function add(x) { return function(y) { return x + y; } }
What distinguishes a function declaration from a function expression in JavaScript?
What distinguishes a function declaration from a function expression in JavaScript?
Flashcards
What are Functions?
What are Functions?
Reusable blocks of code that perform a specific task.
Function Declaration
Function Declaration
A way to create a function using the function keyword.
What is the function keyword?
What is the function keyword?
The keyword used to define a function.
Function Name
Function Name
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Function Parameters
Function Parameters
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Function Body
Function Body
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Calling a Function
Calling a Function
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Code Reusability
Code Reusability
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Local Variable
Local Variable
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Where are Local Variables Declared?
Where are Local Variables Declared?
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Study Notes
- Functions are the core building blocks of a program.
- Functions allow code to be executed multiple times without needing to be rewritten.
- We can create our own functions, in addition to using pre-built ones.
Function Declaration
- Functions are created using a function declaration.
- The
functionkeyword is used first. - Then, the function name is specified.
- A list of parameters is put in parentheses, separated by commas.
- The function's code or "body" is enclosed in curly braces.
function name(parameter1, parameter2,... parameterN) { // body }is the structure of a function.- Functions are called by using their name followed by parentheses:
showMessage(). - Calling a function executes its code.
- Functions help avoid code duplication.
- Changes only need to be made in the function itself.
Local Variables
- Variables declared inside a function are only visible within that function.
- Trying to access a local variable outside of its function results in an error.
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