instance method `blank?`

Ruby on Rails 5.2.8.1

Since v3.1.12

Available in: v3.1.12 v3.2.22.5 v4.0.13 v4.1.16 v4.2.9 v5.2.8.1 v6.0.6 v6.1.7.10 v7.0.10 v7.1.6 v7.2.3 v8.0.4 v8.1.2

Compare with:

blank?()

A string is blank if it’s empty or contains whitespaces only:

''.blank?       # => true
'   '.blank?    # => true
"\t\n\r".blank? # => true
' blah '.blank? # => false

Unicode whitespace is supported:

"\u00a0".blank? # => true

@return [true, false]

Source

# File activesupport/lib/active_support/core_ext/object/blank.rb, line 122
  def blank?
    # The regexp that matches blank strings is expensive. For the case of empty
    # strings we can speed up this method (~3.5x) with an empty? call. The
    # penalty for the rest of strings is marginal.
    empty? ||
      begin
        BLANK_RE.match?(self)
      rescue Encoding::CompatibilityError
        ENCODED_BLANKS[self.encoding].match?(self)
      end
  end

Defined in activesupport/lib/active_support/core_ext/object/blank.rb line 122 · View on GitHub · Improve this page · Find usages on GitHub

Defined in String

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