README

This document explains how to use the library.

Usage

First, you need to import the package into your code:

require('validations-js');

...

Then, follow these instructions for each function:

isEven(number)

Checks if a number is even.

Parameters:

• number: int value.

Examples:

>> isEven(2)
>> true

>> isEven(1)
>> false

isOdd(number)

Checks if a number is odd.

Parameters:

• number: int value.

Examples:

>> isOdd(2)
>> false

>> isOdd(1)
>> true

isPositive(number)

Checks if a number is positive or zero.

Parameters:

• number: numeric value.

Examples:

>> isPositive(2)
>> true

>> isPositive(0.0)
>> true

>> isPositive(-3.1)
>> false

nonPositive(number)

Checks if a number is strictly negative

Parameters:

• number: numeric value.

Examples:

>> nonPositive(2)
>> false

>> nonPositive(0.0)
>> false

>> nonPositive(-3.1)
>> true

isAlphabetic(string)

Checks if an string contains only letters.

Parameters:

• string: string value.

Examples:

>> isAlphabetic("Hello world")
>> true

>> isAlphabetic("This w11l be f4ls3")
>> false

isAlphanumeric(string)

Checks if a string contains only letters and numbers.

Parameters:

• string: string value.

Examples:

>> isAlphanumeric("Hello world")
>> true

>> isAlphanumeric("This w0n'7 be f4ls3")
>> true

>> isAlphanumeric("?????")
>> false

isNumeric(string)

Checks if a string contains only numbers.

Parameters:

• string: string value.

Examples:

>> isNumeric("Hello world")
>> false

>> isNumeric("This w111 be f4ls3")
>> false

>> isNumeric("1234")
>> true

>> isNumeric("3.1415")
>> false

isValidPercentage(number)

Checks that a number that represents a percentage is within the proper bounds.

Parameters:

• number: numeric value.

Examples:

>> isValidPercentage(2)
>> false

>> isValidPercentage(0.0)
>> true

>> isValidPercentage(1.)
>> true

>> isValidPercentage(50.0)
>> false

isValidTimestamp(date, unit):

Checks that a number that represents a date as milliseconds or seconds is correct.

Parameters:

• date: int.

• unit: String. 'millis' if date is in milliseconds, 'seconds' if date is in seconds.

Examples:

>> isValidTimestamp(2, "seconds")
>> false

>> isValidTimestamp(1234567890, "millis")
>> false

>> isValidTimestamp(1465496168, "seconds")
>> true

>> isValidTimestamp(1465496168000, unit="millis")
>> true

present(field_name, dictionary)

Checks if a field is present in an object.

Parameters:

• field_name: string.

• dictionary: object instance.

Examples:

dictionary = {'a': 1, 'b': 2}
>> present('c', dictionary)
>> false

>> present('a', dictionary)
>> true

isEmpty(iterable)

Checks if an iterable is empty

Parameters:

• iterable: Iterable instance (an array or object).

Examples:

>> isEmpty([])
>> true

>> isEmpty([1,2,3])
>> false

>> isEmpty({'a': 1})
>> false

>> isEmpty({})
>> true

nonEmpty(iterable)

Checks if an iterable has at least one element.

Parameters:

• iterable: Iterable instance (an array or object).

Examples:

>> nonEmpty([])
>> false

>> nonEmpty([1,2,3])
>> true

>> nonEmpty({'a': 1})
>> true

>> nonEmpty({})
>> false