Function maybe

maybe('something').map(value => value + ' more').orNull() // produces: "something more"
maybe(null).map(value => value + ' more').orNull() // produces: null
maybe(undefined).map(value => value + ' more').orNull() // produces: null
maybe(NaN).map(value => value + ' more').orNull() // produces: null
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Default Value

for isSomething === not('undefined' || type === 'null' || type === 'nan')
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