binary-case

Take a string and a number and perform binary case switching on alpha characters.

Example

const binaryCase = require('binary-case');

// 3 in binary = 011
const number = 3;

// 011 reversed to 110 so the first 2 characters will toggle case
const value = binaryCase('abc', 3);     // value: "ABc"

Installation

$ npm install binary-case

API

binaryCase ( string, number [, options ] ) : string | boolean

Take a string and a number and perform binary case switching on alpha characters.

Parameters

• string - The string value to toggle alpha character cases on.

• number - A number that will be converted to binary to determine case switching.

• options - An optional object that defines options for the function.

  • allowOverflow - Defaults to true. Set to false to have the binaryCase function return false when the number provided creates a binary string that is larger than the number of alpha characters in the string provided to be converted. Overflow will cause case switching sequences to repeat.

    binaryCase('abc', 0);                               // 'abc'
    binaryCase('abc', 8);                               // 'abc'
    binaryCase('abc', 8, { allowOverflow: false });     // false
    

Returns a string if successful or false on failure.

binaryCase.iterator ( string [, options ] ) : object

Get an iterator object that will allow iteration through all variations of the string's casing.

Parameters

• string - The string to produce case variations for.

• options - An optional object that defines options for the iterator.

  • startIndex - The number to start with for producing variations. This will reduce the total number of possible variations.

Returns an object with a next property.

Example

const iterator = binaryCase.iterator('abc');
iterator.next().value;  // 'abc'
iterator.next().value;  // 'Abc'
iterator.next().value;  // 'aBc'
iterator.next().value;  // 'ABc'

binaryCase.maxNumber ( string ) : number

Determine the maximum number that can be used before causing repeating case variations.

Parameters

• string - The string value to count the number of possible case variations on.

Returns a number.

This calculation is simple:

1. Determine how many alpha characters exist in the string (a through z and A through Z)
2. The result is 2 to the power of the number of alpha characters, minus 1.

For example: abc has 3 alpha characters. 2^3 - 1 = 7

binaryCase.variations ( string ) : string[]

Get an array of all possible case variations.

Parameters

• string - The string value to get case variations for.

Returns an array of strings.