Create a function that receives an integers array and returns the number that appeared only once.
| Input | Output |
|---|---|
| (2,4,6,4,9,6,2) | 9 |
| (1,1,2) | 2 |
| (2,2,1) | 1 |
Create a function that receives a string then it converts uppercase letters into lowercase and vice versa. The function then should print the converted value.
| Input | Output |
|---|---|
| Hello | hELLO |
| Hi | hI |
| Hello World | hELLO wORLD |
| My name is Ali | mY NAME IS aLI |
| sHroog | ShROOG |
Create a function that receives an array of items & arrays and returns one flattened array with all items exluding null values.
| N | Input | Output |
|---|---|---|
| 1 | [1,[2,3,null,4],[null],5] | [1,2,3,4,5] |
| 2 | [7, 0,[null],[null, null, 9]] | [7, 0, 9] |
| 3 | [[null, 3], [2, 4, 5, null], 0, 8, 3] | [3, 2, 4, 5, 0, 8, 3] |
| 4 | [3, 5, [5, 9, 0]] | [3, 5, 5, 9, 0] |
Create a function that receives a string that contains combination of parentheses, square brackets, and curly braces. Then, it returns true if every opening bracket has a closing pair.
| Input | Output |
|---|---|
| }{ | false |
| () | true |
| )({} | false |
| ({ }}) | false |
| ({ }) | true |
| {{()}} | true |
| {{()} | false |
| [{}] | true |
| {[(}]) | true |
| {[}]) | false |