Package Exports

hasprop

This package does not declare an exports field, so the exports above have been automatically detected and optimized by JSPM instead. If any package subpath is missing, it is recommended to post an issue to the original package (hasprop) to support the "exports" field. If that is not possible, create a JSPM override to customize the exports field for this package.

Readme

hasprop

Check if nested object has property, the easy way.

Antiquated way:

var exists = Boolean(
  obj &&
  obj.qux &&
  obj.qux.zee &&
  obj.qux.zee.peep &&
  obj.qux.zee.peep[2] &&
  obj.qux.zee.peep[2].__data);

with hasProp:

var exists = hasProp(obj, ['qux', 'zee', 'peep', 2, '__data']);

Install

npm install hasprop

Usage

var hasProp = require('hasprop');

var obj = {
  foo: 'bar',
  qux: {
    zee: {
      boop: 4,
      peep: [55,'zonk', {
        __data: 'pow'
      }],
    },
    'key.with.dots': 'hello',
    '"key.with.quotes"': {
      greet: 'hi'
    },
    $el: 'element'
  },
  'foo.bar': 'noob',
  qax: null
};

// array for path (recommended)
hasProp(obj, ['foo']) // true
hasProp(obj, ['deedee']) // false
hasProp(obj, ['qux', 'zee', 'boop']) // true
hasProp(obj, ['qux', 'zee', 'peep', 0]) // true
hasProp(obj, ['qux', 'zee', 'peep', 1]) // true
hasProp(obj, ['qux', 'key.with.dots']) // true
hasProp(obj, ['qux', '"key.with.quotes"', 'greet']) // true
hasProp(obj, ['qux', 'zee', 'peep', 2]) // true
hasProp(obj, ['qux', 'zee', 'peep', 2, '__data']) // true
hasProp(obj, ['qux', '$el']) // true
hasProp(obj, ['foo.bar']) // true
hasProp(obj, ['qux', 'qux']) // false

// string for path
hasProp(obj, 'foo') // true
hasProp(obj, 'deedee') // false
hasProp(obj, 'qux.zee.boop') // true
hasProp(obj, 'qux.zee.peep.0') // true
hasProp(obj, 'qux.zee.peep.1') // true
hasProp(obj, 'qux.zee.peep[1]') // true
hasProp(obj, 'qux[key.with.dots]') // true
hasProp(obj, 'qux["key.with.quotes"].greet') // true
hasProp(obj, 'qux.zee.peep.2') // true
hasProp(obj, 'qux.zee.peep.2.__data') // true
hasProp(obj, 'qux.$el') // true
hasProp(obj, '[foo.bar]') // true
hasProp(obj, 'qux.qux') // false

Partially applied:

var objHasProp = hasProp(obj);

objHasProp(['foo']) //  true
objHasProp('[foo.bar']) // true
objHasProp(['qux']) // true
objHasProp(['yo']) // false

For getting the value, check out the module getprop.

License

MIT