https://goo.gl/cHhtds

jsonParse.js

// `tryCatch` is useful when you want to do assignment and have a sane default 

// The value provided is not parseable, so we get `{}` because there was an error
tryCatch(JSON.parse, always({}))('{{50')
// {}

// Here, the value is parseable, so we get the parsed object literal
tryCatch(JSON.parse, always({}))('{ "foo": "HI" }')
// {"foo": "HI"}

// ---------------------------------------

// Let's make a safe JSON.parse
const jsonParse = curry((defaultValue, x) => 
  tryCatch(JSON.parse, always(defaultValue))(x)
)

const foo = jsonParse('nope', '54 {}')
// 'nope'

const bar = jsonParse('nope', '{}')
// {}