class method

ENV.delete_if

ENV.delete_if { |name, value| block } → ENV

ENV.delete_if → an_enumerator

static VALUE
env_delete_if(VALUE ehash)
{
    RETURN_SIZED_ENUMERATOR(ehash, 0, 0, rb_env_size);
    env_reject_bang(ehash);
    return envtbl;
}

Yields each environment variable name and its value as a 2-element Array, deleting each environment variable for which the block returns a truthy value, and returning ENV (regardless of whether any deletions):

Example

ENV.replace('foo' => '0', 'bar' => '1', 'baz' => '2')
ENV.delete_if { |name, value| name.start_with?('b') } # => ENV
ENV # => {"foo"=>"0"}
ENV.delete_if { |name, value| name.start_with?('b') } # => ENV

Returns an Enumerator if no block given:

Example

ENV.replace('foo' => '0', 'bar' => '1', 'baz' => '2')
e = ENV.delete_if # => #<Enumerator: {"bar"=>"1", "baz"=>"2", "foo"=>"0"}:delete_if!>
e.each { |name, value| name.start_with?('b') } # => ENV
ENV # => {"foo"=>"0"}
e.each { |name, value| name.start_with?('b') } # => ENV

See also .delete .dup .clone .each also in 4.1 · 3.4 · 3.3 · 3.2 · 3.1 · 3.0

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