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instance method

Numeric#nonzero?

num.nonzero? → self or nil

static VALUE
num_nonzero_p(VALUE num)
{
    if (RTEST(num_funcall0(num, rb_intern("zero?")))) {
        return Qnil;
    }
    return num;
}

Returns self if num is not zero, nil otherwise.

This behavior is useful when chaining comparisons:

Example

a = %w( z Bb bB bb BB a aA Aa AA A )
b = a.sort {|a,b| (a.downcase <=> b.downcase).nonzero? || a <=> b }
b   #=> ["A", "a", "AA", "Aa", "aA", "BB", "Bb", "bB", "bb", "z"]

See also #negative? #numerator #modulo #phase also in 4.1 · 4.0 · 3.4 · 3.3 · 3.2 · 3.1

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