Vandelay-util NPM

vandelay-util

Install

npm install vandelay-util --save

Utilities

Utility functions will return undefined when given null or invalid values when appropriate.

For example:

const row = {
  name: 'pear'
}

util.capitalize(row.notes) // undefined
util.convert(row.speed).from('m/h').to('km/h') // undefined

util.guid(...values)

Stringifies all provided values and turns them into a deterministic GUID. Null values are ignored.

util.guid('Michael Scott', 'Birthday', null, 1993) // f8e61be1-0b1c-4e4f-81b6-050ae9b8a049

util.slug(...values)

Stringifies all provided values and turns them into a lowercase slug. Null values are ignored.

Note: This function will remove many characters, including non-english characters. Use with caution if you are using this for a unique ID.

util.slug('Michael Scott', 'Birthday', null, 1993) // michael-scott-birthday-1993

util.normalize(value)

Trims, lowercases, and removes redundant whitespace from the given value.

util.normalize('\t  HEY  \n THANKS') // hey thanks

util.capitalize(value)

Capitalizes the first word in the given value.

util.capitalize.words(value)

Capitalizes every word in the given value.

util.camelize(value)

Camelcases the given value.

util.decamelize(value)

Converts camelcase to non-camelcase - separated by spaces.

util.phone(value, country)

Normalizes any phone number in the world. Country is any three letter country code, defaulting to 'USA'. If the number includes a country code, you do not need to provide a country argument.

util.phone(' 123 ') // undefined
util.phone(123) // undefined

// USA numbers
util.phone('4805335949') // +14805335949
util.phone('(480) 533-5949') // +14805335949
util.phone('480-533-5949') // +14805335949
util.phone(4805335949) // +14805335949

// Hong Kong numbers
util.phone('6123-6123') // undefined
util.phone('6123-6123', 'HKG') // +85261236123
util.phone('+852 6123-6123') // +85261236123
})

util.convert(value)

Exposes convert-units, with additional handling of null and invalid values. For a full list of convertible units, see this page.

util.convert(null).from('m/h').to('km/h') // undefined
util.convert('1').from('F').to('C') // -17.22222222222222
util.convert(1).from('mi').to('km') // 1.6093439485009937

util.moment(value)

Exposes moment + moment-timezone, with additional handling of null and invalid values. For a full list of time zones, see this page.

util.moment(null) // undefined
util.moment('12/27/1993') // moment object
util.moment.tz('12/27/1993', 'America/New_York') // moment object

util.memo(function)

Exposes memoization helpers, with additional handling of null and invalid values. For a full usage guide, see this page.

// Fetch a request only once
const getLocationData = util.memo.promise(async () =>
  util.request('http://google.com/fetch-only-once.json')
)

// Cache synchronous computation
const getTotal = util.memo((data) => {
  return data
    .map((i) => i.count)
    .reduce((prev, curr) =>
      prev + curr
    , 0)
})

util.date(value, timezone)

Wrapper around moment.js moment.tz(date, timezone) that handles null and invalid values. Search timezones here.

util.date('abc', 'America/New_York') // undefined
util.date(null, 'America/Los_Angeles') // undefined
util.date('12/27/1993', 'America/New_York') // 1993-12-27T05:00:00.000Z

util.number(value)

Wrapper around number parsing that handles null and invalid values.

util.number('$100.56') // 100.56
util.number(100.56) // 100.56
util.number('costs $100.56') // 100.56
util.number('it is -100.56') // -100.56

util.geo.isSea(value)

Returns true if the coordinate is in the sea. Value can be either [ lon, lat ] or a GeoJSON Point.

util.geo.isSea([ 0, 0 ]) // true

util.geo.tz(point)

Returns the timezone for a given point. Value returned can be used as the timezone for util.date. Value can be either [ lon, lat ] or a GeoJSON Point.

util.geo.tz([ -118.250587 , 34.031179 ]) // America/Los_Angeles

util.geo.tz({
  type: 'Point',
  coordinates: [ 121.456424, 31.224417 ]
}) // Asia/Shanghai

util.geo.reproject(geojson, sourceProjection)

Parses GeoJSON and reprojects it into WGS84. If the GeoJSON has a crs attribute it will auto-detect it, otherwise you can specify it as the second argument.

// Auto-detection based on the input data
util.geo.reproject({
  type: 'Point',
  crs: {
    type: 'name',
    properties: {
      name: 'EPSG:3006'
    }
  },
  coordinates: [
    319180,
    6399862
  ]
}) // { type: 'Point', coordinates: [ 11.965261850066433, 57.704505637111694 ] }


// Manually specifying it, any EPSG code or URN is acceptable
util.geo.reproject({
  type: 'Point',
  coordinates: [
    319180,
    6399862
  ]
}, 'EPSG:3006') // { type: 'Point', coordinates: [ 11.965261850066433, 57.704505637111694 ] }

util.geo.multi(value)

Converts any given GeoJSON geometry to a Multi version. Values that are already a Multi geometry will be returned with no modifications.

util.geo.multi({
  type: 'Polygon',
  coordinates: [
    [ [ 100.0, 0.0 ], [ 101.0, 0.0 ], [ 101.0, 1.0 ], [ 100.0, 1.0 ], [ 100.0, 0.0 ] ],
    [ [ 100.2, 0.2 ], [ 100.8, 0.2 ], [ 100.8, 0.8 ], [ 100.2, 0.8 ], [ 100.2, 0.2 ] ]
  ]
})

util.geo.simplify(value)

Simplifies any given GeoJSON geometry to the precision of a meter. Values that do not need simplification will be returned with no modifications.

util.geo.simplify({
  type: 'Polygon',
  coordinates: [
    [ [ 100.0, 0.0 ], [ 101.0, 0.0 ], [ 101.0, 1.0 ], [ 100.0, 1.0 ], [ 100.0, 0.0 ] ],
    [ [ 100.2, 0.2 ], [ 100.8, 0.2 ], [ 100.8, 0.8 ], [ 100.2, 0.8 ], [ 100.2, 0.2 ] ]
  ]
})

util.geo.wk2JSON(value)

Converts Well-Known-Text to GeoJSON - supports WKT/WKB/EWKT/EWKB/TWKB.

util.geo.wk2JSON('POINT(1 2)') // { type: 'Point', coordinates: [1, 2] }

util.geo.intersection({ intersection, city, region, country, sources })

Returns a geopoint for an intersection. For example:

util.geo.intersection({
  intersection: '12th Ave./Hammond St.',
  city: 'Lost Wages',
  region: 'NV',
  country: 'USA'
})

util.geo.intersection({
  intersection: '24th Ave., Avery St.',
  city: 'Lost Wages',
  region: 'NV',
  country: 'USA'
})