Method: Enumerable#all?

Defined in:

enum.c

#all? ⇒ Boolean #all?(pattern) ⇒ Boolean #all? {|element| ... } ⇒ Boolean

Returns whether every element meets a given criterion.

If self has no element, returns true and argument or block are not used.

With no argument and no block, returns whether every element is truthy:

(1..4).all?           # => true
%w[a b c d].all?      # => true
[1, 2, nil].all?      # => false
['a','b', false].all? # => false
[].all?               # => true

With argument pattern and no block, returns whether for each element element, pattern === element:

(1..4).all?(Integer)                 # => true
(1..4).all?(Numeric)                 # => true
(1..4).all?(Float)                   # => false
%w[bar baz bat bam].all?(/ba/)       # => true
%w[bar baz bat bam].all?(/bar/)      # => false
%w[bar baz bat bam].all?('ba')       # => false
{foo: 0, bar: 1, baz: 2}.all?(Array) # => true
{foo: 0, bar: 1, baz: 2}.all?(Hash)  # => false
[].all?(Integer)                     # => true

With a block given, returns whether the block returns a truthy value for every element:

(1..4).all? {|element| element < 5 }                    # => true
(1..4).all? {|element| element < 4 }                    # => false
{foo: 0, bar: 1, baz: 2}.all? {|key, value| value < 3 } # => true
{foo: 0, bar: 1, baz: 2}.all? {|key, value| value < 2 } # => false

Related: #any?, #none? #one?.

Overloads:

• #all? ⇒ Boolean

  Returns:

  • (Boolean)
• #all?(pattern) ⇒ Boolean

  Returns:

  • (Boolean)
• #all? {|element| ... } ⇒ Boolean

  Yields:

  • (element)

  Returns:

  • (Boolean)

# File 'enum.c', line 1855

static VALUE
enum_all(int argc, VALUE *argv, VALUE obj)
{
    struct MEMO *memo = MEMO_ENUM_NEW(Qtrue);
    WARN_UNUSED_BLOCK(argc);
    ENUM_BLOCK_CALL(all);
    return memo->v1;
}