best-library

This library provides a set of functions that facilitate the work in Javascript. Library development continues.

Available functions

• randomNum
• randomArray
• createArray
• arrayOperations
• lastElem
• sortArray
• bubbleSort
• selectionSort
• insertionSort
• binarySearch
• interpolationSearch
• factorial
• fibonacci
• RLE
• upperFirst
• measureTime

Installation

$ npm i best-library

In Node.js:

const bl = require('best-library');

---

bl.randomNum([min = 0], max)

The function returns a random number in the range from the first argument to the second argument

Arguments

1. [min = 0] (number): The lower bound of an interval
2. max (number): The upper bound of an interval 

Returns

(number): Returns a random number

Examples

const number = bl.randNum(0, 10);
console.log(number); // 7

const number = bl.randNumb(10);
console.log(number); // 5

---

bl.randomArray(size, min, max, [unique = false])

The function returns an array of random numbers

Arguments

1. size (number): The Size of an array
2. min (number): The lower bound
3. max (number): The upper bound
4. unique = false (boolean): If the variable === true, the function will return an array of unique numbers

Returns

(array): Returns an array of random numbers

Examples

const array = bl.randArr(10, 0, 15, false);
console.log(array); // (10) [7, 0, 9, 9, 3, 10, 4, 3, 6, 6]

const array = bl.randArr(10, 0, 15, true);
console.log(array) // (10) [14, 4, 1, 7, 11, 15, 12, 0, 9, 6]

---

bl.createArray(length, element)

Create an array filled with identical elements

Arguments

1. length (number): Array length
2. element (string|number|boolean|underfined|null|object): Array element

Returns

(array): Returns array

Examples

const array = bl.createArray(3, new String());
console.log(array); // (3) [String, String, String]

---

bl.arrayOperations(array1, array2, operation)

The function performs mathematical operations on arrays. The result is written to the first array.

Arguments

1. array1 (array): The first array to perform operation
2. array2 (array): The second array to perform operation
3. operation (string): The operation that is performed on arrays

Returns

The function returns nothing

Examples

const array1 = [4, 5, 0, 1, 7];
const array2 = [9, 4, 8, 1, 2];
bl.operArr(array1, array2, '*');
console.log(array1); // (5) [36, 20, 0, 1, 14]

---

bl.lastElem(array)

Find last array element

Arguments

1. array (array): The array to find last element

Returns

(all types): Returns last array element

Examples

const array = [4, 5, 0, 1, 7];
const elem = bl.lastElem(array);
console.log(elem); // 7

---

bl.sortArray(array)

Sort array

Arguments

1. array (array): The array to sort

Examples

const array = [5, 1, 3, 0, 3, 5, 9, 8, 1, 2];
bl.sortArr(array);
console.log(array); // (10) [0, 1, 1, 2, 3, 3, 5, 5, 8, 9]

---

bl.bubbleSort(array)

Sort the array by bubble sort

Arguments

1. array (array): The array to sort

Examples

const array = [-1, 5, 8, 0, -6, -5, 3, 4, 1, 0];
bl.bubbleSort(array);
console.log(array); // (10) [ -6, -5, -1, 0, 0, 1, 3, 4, 5, 8 ]

---

bl.selectionSort(array)

Sort the array by selection sort

Arguments

1. array (array): The array to sort

Examples

const array = [5, 1, -3, -3, 3, -5, 6, 8, 1, 0];
bl.selectionSort(array);
console.log(array); // (10) [ -5, -3, -3, 0, 1, 1, 3, 5, 6, 8 ]

---

bl.insertionSort(array)

Sort the array by insertion sort

Arguments

1. array (array): The array to sort 

Examples

const array = [5, 1, -3, -3, 3, -5, 6, 8, 1, 0];
bl.insertionSort(array);
console.log(array); // (10) [ -5, -3, -3, 0, 1, 1, 3, 5, 6, 8 ]

---

bl.binarySearch(array, element)

Find element index

Arguments

1. element (number):  The element to find index
2. array (array): The sorted array to find element index

Returns

The function returns element index or -1

Examples

const array = [-4, 0, 8, 9, 11];
const index = bl.binarySearch(array, 0);
console.log(index); // 1

---

bl.interpolationSearch(array, element)

Find element index

Arguments

 1. element (number):  The element to find index
 2. array (array): The sorted array to find element index

Returns

The function returns element index or -1

Examples

const array = [3, 5, 9, 11, 15, 98, 505];
const index = bl.interpolationSearch(array, 9);
console.log(index); // 2

---

bl.factorial(number)

Calculate the factorial of numbers

Arguments

1. number (number): The number to calculate factorial

Returns

(number): Returns the factorial of a number

Examples

const num = bl.factorial(5);
console.log(num); // 120

---

bl.fibonacci(number)

Calculate the fibonacci number

Arguments

1. number (number): The number to calculate fibonacci number

Returns

(number): Returns the nth fibonacci number

Examples

const num = bl.fibonacci(18);
console.log(num); // 1597

---

bl.RLE(str)

Compress string

Arguments

1. str (string): The string to compress

Returns

(string): Returns compressed string

Examples

const str = 'AAAABBBCCXYZDDDDEEEFFFAAAAAABBBBB';
const compressedStr = RLE(str);
console.log(compressedStr); // A4B3C2X1Y1Z1D4E3F3A6B5

---

bl.upperFirst(string)

Translate to upper case first string letter

Arguments

1. string (string): The string to modify  

Returns

(string): Returns the modify string

Examples

const str = 'hello, world!'
console.log(bl.upperFirst(str)); // Hello, World!;

---

This function workable only in browser!

bl.measureTime(callback, [args1], [args2], ...)

Measure function execution time

Arguments

1. callback (function): The function whose time is to be measured
2. [args1], [args2], ... : Callback function arguments

Returns

(object|number): If the callback function returns a value, 
                 the measureTime function returns object {time: number, answer: *}
                 else returns only function execuite time

Examples

const answer = measureTime(bestLibrary.bubbleSort, [5, 9, 1, 2, -5]);
console.log(answer); // 0.14999999984866008;

const answer = measureTime(bestLibrary.fibonacci, 40);
console.log(answer); // {time: 1181.5399999995861, answer: 63245986}