Value (helping-js/core/value)

Single helper: isEmptyValue — “empty” in the sense of common form defaults (aligned with helper-js empty), not Object.is empty.

Import

import { isEmptyValue } from 'helping-js/core/value'

Semantics

Returns true for:

• null, undefined
• '' (empty string)
• [] (empty array)
• {} (empty plain object)
• false
• 0
• NaN

Returns false for non-empty strings, non-zero numbers, non-empty arrays/objects, true, etc.

Samples

Form validation

if (isEmptyValue(form.email)) {
  errors.email = 'Required'
}

React: disable submit

import { isEmptyValue } from 'helping-js/core/value'

<button disabled={isEmptyValue(value)}>Save</button>

Express: optional body field

import { isEmptyValue } from 'helping-js/core/value'

if (!isEmptyValue(req.body.notes)) {
  await saveNotes(req.body.notes)
}

For type checks (isString, isPlainObject, …) use helping-js/core/types instead.

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