Elyses Enchantments
10 Points
arrays
Instructions
As a magician-to-be, Elyse needs to practice some basics. She has a stack of cards that she wants to manipulate.
To make things a bit easier she only uses the cards 1 to 10 so her stack of cards can be represented by an array of numbers. The position of a certain card corresponds to the index in the array. That means position 0 refers to the first card, position 1 to the second card etc.
<!-- prettier-ignore-start -->Note
All but two functions should update the array of cards and then return the modified array - a common way of working known as the Builder pattern, which allows you to nicely daisy-chain functions together.
The two exceptions are getItem, which should return the card at the given position, and checkSizeOfStack which should return true if the given size matches.
1. Retrieve a card from a stack
To pick a card, return the card at index position from
the given stack.
const position = 2;
getItem([1, 2, 4, 1], position);
// => 42. Exchange a card in the stack
Perform some sleight of hand and exchange the card at index position
with the replacement card provided.
Return the adjusted stack.
const position = 2;
const replacementCard = 6;
setItem([1, 2, 4, 1], position, replacementCard);
// => [1, 2, 6, 1]3. Insert a card at the top of the stack
Make a card appear by inserting a new card at the top of the stack. Return the adjusted stack.
const newCard = 8;
insertItemAtTop([5, 9, 7, 1], newCard);
// => [5, 9, 7, 1, 8]4. Remove a card from the stack
Make a card disappear by removing the card at the given position from the stack.
Return the adjusted stack.
const position = 2;
removeItem([3, 2, 6, 4, 8], position);
// => [3, 2, 4, 8]5. Remove the top card from the stack
Make a card disappear by removing the card at the top of the stack. Return the adjusted stack.
removeItemFromTop([3, 2, 6, 4, 8]);
// => [3, 2, 6, 4]6. Insert a card at the bottom of the stack
Make a card appear by inserting a new card at the bottom of the stack. Return the adjusted stack.
const newCard = 8;
insertItemAtBottom([5, 9, 7, 1], newCard);
// => [8, 5, 9, 7, 1]7. Remove a card from the bottom of the stack
Make a card disappear by removing the card at the bottom of the stack. Return the adjusted stack.
removeItemAtBottom([8, 5, 9, 7, 1]);
// => [5, 9, 7, 1]8. Check the size of the stack
Check whether the size of the stack is equal to stackSize or not.
const stackSize = 4;
checkSizeOfStack([3, 2, 6, 4, 8], stackSize);
// => falseElyses Enchantments
10 Points
arrays
Instructions
As a magician-to-be, Elyse needs to practice some basics. She has a stack of cards that she wants to manipulate.
To make things a bit easier she only uses the cards 1 to 10 so her stack of cards can be represented by an array of numbers. The position of a certain card corresponds to the index in the array. That means position 0 refers to the first card, position 1 to the second card etc.
<!-- prettier-ignore-start -->Note
All but two functions should update the array of cards and then return the modified array - a common way of working known as the Builder pattern, which allows you to nicely daisy-chain functions together.
The two exceptions are getItem, which should return the card at the given position, and checkSizeOfStack which should return true if the given size matches.
1. Retrieve a card from a stack
To pick a card, return the card at index position from
the given stack.
const position = 2;
getItem([1, 2, 4, 1], position);
// => 42. Exchange a card in the stack
Perform some sleight of hand and exchange the card at index position
with the replacement card provided.
Return the adjusted stack.
const position = 2;
const replacementCard = 6;
setItem([1, 2, 4, 1], position, replacementCard);
// => [1, 2, 6, 1]3. Insert a card at the top of the stack
Make a card appear by inserting a new card at the top of the stack. Return the adjusted stack.
const newCard = 8;
insertItemAtTop([5, 9, 7, 1], newCard);
// => [5, 9, 7, 1, 8]4. Remove a card from the stack
Make a card disappear by removing the card at the given position from the stack.
Return the adjusted stack.
const position = 2;
removeItem([3, 2, 6, 4, 8], position);
// => [3, 2, 4, 8]5. Remove the top card from the stack
Make a card disappear by removing the card at the top of the stack. Return the adjusted stack.
removeItemFromTop([3, 2, 6, 4, 8]);
// => [3, 2, 6, 4]6. Insert a card at the bottom of the stack
Make a card appear by inserting a new card at the bottom of the stack. Return the adjusted stack.
const newCard = 8;
insertItemAtBottom([5, 9, 7, 1], newCard);
// => [8, 5, 9, 7, 1]7. Remove a card from the bottom of the stack
Make a card disappear by removing the card at the bottom of the stack. Return the adjusted stack.
removeItemAtBottom([8, 5, 9, 7, 1]);
// => [5, 9, 7, 1]8. Check the size of the stack
Check whether the size of the stack is equal to stackSize or not.
const stackSize = 4;
checkSizeOfStack([3, 2, 6, 4, 8], stackSize);
// => false