astype

astype

Convert an unknown type to a string, boolean, or number (integer, or float)

• Installation
• Usage
• Options

Installation

$ npm install --save astype

Usage

import as from 'astype';

as.number('1'); // 1
as.integer('55.1'); // 55
as.boolean(0); // false
as.string(true); // "true"

Available conversions

• number(...) (aliases: double(), float())
  • allows decimal places (1.1)
• integer(...)
  • truncates decimal places (1.1 => 1)
• boolean(...) (aliases: bool())
• string(...)

Options

Global

This will set the behavior anytime a conversion is used.
This allows simplier syntax when using the same rules.

as.setGlobal({
  number: { ... },
  boolean: { ... },
  string: { ... }
});

You can also unset global options as well.
Passing an empty object or null will unset all options under that key.

as.unsetGlobal({
  number: { ... },
  boolean: { ... },
  string: { ... }
})

Per Query

You can also pass through options in the conversion, these will override any global options.

as.number(..., { ... })

Available Options

number

• allowNull (default: true)

  • If true: conversion can return the value null
  • If false: conversion will return 0 if null

• allowUndefined (default: true)

  • If true: conversion can return the value undefined
  • If false: conversion will return 0 if undefined

• allowNaN (default: true)

  • If true: conversion can return the value NaN
  • If false: conversion will return 0 if NaN

• allowInfinity (default: true)

  • If true: conversion can return the value Infinity
  • If false: conversion will return 0 if Infinity

• allowFindInString (default: true)

  • If true: conversion can will pick out numbers from a string
    (eg: 'abc123!' => 123)
  • If false: conversion will return NaN if allowNaN is true, otherwise 0

• allowDecimals (default: true)

  • If true: will allow decimal places in numbers (eg: '1.9' => 1.9)
  • If false: will truncate decimal places (eg: '1.9' => 1)

boolean

• allowNull (default: true)

  • If true: conversion can return the value null
  • If false: conversion will return 0 if null

• allowUndefined (default: true)

  • If true: conversion can return the value undefined
  • If false: conversion will return 0 if undefined

• parseString (default: true)

  • If true: will parse the strings "true" and "false" to true and false respectively
  • If false: will parse the string to a boolean (Boolean("string"))

• convertNumbers (default: true)

  • If true: if the input is a number (or string that is a number), it will parse as a number first, then convert to a boolean
    (eg: '1' => 1 => true)
  • If false: will parse the string to a boolean (Boolean(1))

string

• allowNull (default: true)

  • If true: conversion can return the value null
  • If false: conversion will return 0 if null

• allowUndefined (default: true)

  • If true: conversion can return the value undefined
  • If false: conversion will return 0 if undefined

License

MIT © Tyler Stewart