Mod 0 Functions

Question 1

Write a function that returns undefined, but that task is already complete.

Answer 1

function nothing() {

}

Question 2

Complete a function that takes no parameters and returns true. Add a statement that will cause this function to return true when ran.

Answer 2

**function returnTrue() {
 return true;**
 *// returns true*
**}**

Question 3

Complete a function that takes one number parameter, adds two to that number, then returns the result.

Answer 3

• *function addTwo(num) {**
• // return the input number plus 2*
• *return num + 2;**
• *}**

Question 4

• Complete a function that takes two parameters, a string and number (will refer to an index within the string).
• The function should return the character within the string, located at the given number index.

Answer 4

function returnACharacter(string, index) {

// returns string character at given index

return string[index];
}

Question 5

Complete a function that takes in an array parameter, and returns it.

Answer 5

function returnArray(array) {
// return the array
return(array);
}

Question 6

Complete a function that takes in an array and a number (will refer to an index within the array). The function should return the element located within the array at the given number index.

Answer 6

function returnAnElement(array, index) {

// returns array element at given index

return array[index];
}

Question 7

This function should create an array, and return it.

Answer 7

• *function createAndReturnAnArray() {**
• // create an array*
• *var array = [];**
• // return the created array*

return array;
}

Question 8

We are going to complete a function that takes in an object parameter, and returns it.

Answer 8

• *function returnObject(object) {**
• // return the object*

return object;​
}

Question 9

• Complete a function that takes in an object and a string (will refer to a key in the object).
• The function should return the value of the property located within the object at the given string key.

Answer 9

**function returnAValue(obj, key) {**
 // returns value of inputted object's property located at key
 **return obj[key];
}**

Question 10

Complete a function that takes no parameters. This function should create an object, and return it.

Answer 10

**function createAndReturnAnObject() {**
 // create an object
 **var obj = {a: "object"};**
 // return the created object

• *return obj;**
• *}**

Question 11

We are going to write a function that returns the type of argument the function has been called with (assume the argument will be scalar - not a collection).

Answer 11

function getType(param) {
// returns the type of param
return typeof param;
}

Question 12

We are going to write a function that returns true if the argument is an Array, and false if it is not

Answer 12

**function determineIsAnArray(input) {**
 // assign result variable to call to Array.isArray
 **var result = Array.isArray(input);**
 // return result variable
 **return result;
}**