logic

either(mainFn, failOver) → function()

Will evaluate the first function, if it throws any exception will evaluate the second one.

const jsonOr = either(parse.JSON,value => `Cannot parse ${value} as json`)
jsonOr(null) // -> "Cannot parse null as json"

const jsonOr = either(parse.JSON,33)
jsonOr(null) // -> 33
jsonOr('{"a":1}') // -> {a:1}

Returns

function() 

excepting to receive fn arguments.

fnOrValue(fnOrVal) → any type

Given a value that can be a function if it's a function we call it passing the data to it if not we just return it

fnOrValue(3,4) // -> 3
fnOrValue(4,null) // -> 4
fnOrValue(x => x+1,4) // -> 5
fnOrValue(x => x*2,4) // -> 8

Returns

any type 

identity(x) → any type

Function that returns the passed value

[1,2].map(identity) // -> [1,2]

Returns

any type 

any value

not(fn) → Boolean

Function that negates any passed function value

const isNumber = not(isNaN)
isNumber(33) // -> true

Returns

Boolean 

negated boolean value