Method: Array#keep_if

Defined in:
array.c

#keep_if {|element| ... } ⇒ self #keep_if ⇒ Object

With a block given, calls the block with each element of self; removes the element from self if the block does not return a truthy value:

a = [:foo, 'bar', 2, :bam]
a.keep_if {|element| element.to_s.start_with?('b') } # => ["bar", :bam]

With no block given, returns a new Enumerator.

Related: see Methods for Deleting.

Overloads:

  • #keep_if {|element| ... } ⇒ self

    Yields:

    • (element)

    Returns:

    • (self) 


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# File 'array.c', line 3989

static VALUE
rb_ary_keep_if(VALUE ary)
{
    RETURN_SIZED_ENUMERATOR(ary, 0, 0, ary_enum_length);
    rb_ary_select_bang(ary);
    return ary;
}