Return true if the named file exists.
file_name can be an IO object.
“file exists” means that stat() or fstat() system call is successful.
Deprecated method. Don’t use.
Returns true if the named file has the sticky bit set.
Initiates garbage collection, unless manually disabled.
This method is defined with keyword arguments that default to true:
def GC.start(full_mark: true, immediate_sweep: true); end
Use full_mark: false to perform a minor GC. Use immediate_sweep: false to defer sweeping (use lazy sweep).
Note: These keyword arguments are implementation and version dependent. They are not guaranteed to be future-compatible, and may be ignored if the underlying implementation does not support them.
The number of times GC occurred.
It returns the number of times GC occurred since the process started.
Returns a Hash containing information about the GC.
The hash includes information about internal statistics about GC such as:
{
:count=>0,
:heap_allocated_pages=>24,
:heap_sorted_length=>24,
:heap_allocatable_pages=>0,
:heap_available_slots=>9783,
:heap_live_slots=>7713,
:heap_free_slots=>2070,
:heap_final_slots=>0,
:heap_marked_slots=>0,
:heap_swept_slots=>0,
:heap_eden_pages=>24,
:heap_tomb_pages=>0,
:total_allocated_pages=>24,
:total_freed_pages=>0,
:total_allocated_objects=>7796,
:total_freed_objects=>83,
:malloc_increase_bytes=>2389312,
:malloc_increase_bytes_limit=>16777216,
:minor_gc_count=>0,
:major_gc_count=>0,
:remembered_wb_unprotected_objects=>0,
:remembered_wb_unprotected_objects_limit=>0,
:old_objects=>0,
:old_objects_limit=>0,
:oldmalloc_increase_bytes=>2389760,
:oldmalloc_increase_bytes_limit=>16777216
}
The contents of the hash are implementation specific and may be changed in the future.
This method is only expected to work on C Ruby.
Returns the Base64-encoded version of bin. This method complies with RFC 2045. Line feeds are added to every 60 encoded characters.
require 'base64' Base64.encode64("Now is the time for all good coders\nto learn Ruby")
Generates:
Tm93IGlzIHRoZSB0aW1lIGZvciBhbGwgZ29vZCBjb2RlcnMKdG8gbGVhcm4g UnVieQ==
Returns the Base64-decoded version of str. This method complies with RFC 2045. Characters outside the base alphabet are ignored.
require 'base64' str = 'VGhpcyBpcyBsaW5lIG9uZQpUaGlzIG' + 'lzIGxpbmUgdHdvClRoaXMgaXMgbGlu' + 'ZSB0aHJlZQpBbmQgc28gb24uLi4K' puts Base64.decode64(str)
Generates:
This is line one This is line two This is line three And so on...
Returns the cosine of z, where z is given in radians
CMath.cos(1 + 1i) #=> (0.8337300251311491-0.9888977057628651i)
Returns the hyperbolic cosine of z, where z is given in radians
CMath.cosh(1 + 1i) #=> (0.8337300251311491+0.9888977057628651i)
Returns the arc cosine of z
CMath.acos(1 + 1i) #=> (0.9045568943023813-1.0612750619050357i)
returns the inverse hyperbolic cosine of z
CMath.acosh(1 + 1i) #=> (1.0612750619050357+0.9045568943023813i)
Returns the cosine of z, where z is given in radians
CMath.cos(1 + 1i) #=> (0.8337300251311491-0.9888977057628651i)
Returns the hyperbolic cosine of z, where z is given in radians
CMath.cosh(1 + 1i) #=> (0.8337300251311491+0.9888977057628651i)
Returns the arc cosine of z
CMath.acos(1 + 1i) #=> (0.9045568943023813-1.0612750619050357i)
returns the inverse hyperbolic cosine of z
CMath.acosh(1 + 1i) #=> (1.0612750619050357+0.9045568943023813i)
Get the front object of the current server.
This raises a DRbServerNotFound error if there is no current server. See current_server.
Get the front object of the current server.
This raises a DRbServerNotFound error if there is no current server. See current_server.
Returns an Array of method names which have any options.
p FileUtils.commands #=> ["chmod", "cp", "cp_r", "install", ...]
Computes the cosine of x (expressed in radians). Returns a Float in the range -1.0..1.0.
Domain: (-INFINITY, INFINITY)
Codomain: [-1, 1]
Math.cos(Math::PI) #=> -1.0
Computes the arc cosine of x. Returns 0..PI.
Domain: [-1, 1]
Codomain: [0, PI]
Math.acos(0) == Math::PI/2 #=> true
Computes the hyperbolic cosine of x (expressed in radians).
Domain: (-INFINITY, INFINITY)
Codomain: [1, INFINITY)
Math.cosh(0) #=> 1.0
Computes the inverse hyperbolic cosine of x.
Domain: [1, INFINITY)
Codomain: [0, INFINITY)
Math.acosh(1) #=> 0.0