End of Life Ruby 3.0 has reached end of life and gets no more fixes. Switch to Ruby 4.0 →

instance method

Numeric#truncate

num.truncate([ndigits]) → integer or float

static VALUE
num_truncate(int argc, VALUE *argv, VALUE num)
{
    return flo_truncate(argc, argv, rb_Float(num));
}

Returns num truncated (toward zero) to a precision of ndigits decimal digits (default: 0).

Numeric implements this by converting its value to a Float and invoking Float#truncate.

See also #to_int #zero? #to_c also in 4.1 · 4.0 · 3.4 · 3.3 · 3.2 · 3.1