Numerical string to number convert

index.js

// "1.2" -> 1.2
console.assert(convert('1.2') === 1.2)
// " " -> " " (not a number)
console.assert(isNaN(convert(' ')))
console.assert(isNaN(convert('')))
// "12a" -> "12a" (not a number)
console.assert(convert('12a') === '12a')
console.assert(isNaN(convert('12a')))
// null -> null (not a number)
console.assert(convert(null) === null)
// false -> false (not a number)
console.assert(convert(false) === false)

function convert(value)  {
  if (typeof value === 'string') {
    // Parse doubly escaped line feeds
    value = value.replace(/(\\n)/g, '\n')

    // Typecast numerical looking values
    value = isNaN(value) ? value : Number.parseFloat(value)
  }

  return value
}