compare
Definition: | integer i = compare(object a, b) | ||||||
Description: |
Sequences are compared "alphabetically" starting with the first element until a difference is found. Note that Euphoria typically needs equal() or compare() on each and every non-trivial conditional test, whereas Phix can just use the more natural infix operators =, <=, etc. Apart from the obvious legacy code and compatibility with Euphoria, compare is also very useful in sort routines and the like. You can also use sq_cmp() to obtain nested element-wise results. |
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pwa/p2js: | Supported. | ||||||
Example 1: |
x = compare({1,2,{3,{4}},5}, {2-1,1+1,{3,{4}},6-1}) -- identical, x is 0 |
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Example 2: |
if compare("ABC", "ABCD") < 0 then -- -1 -- will be true: ABC is "less" because it is shorter end if |
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Example 3: |
x = compare({12345, 99999, -1, 700, 2}, {12345, 99999, -1, 699, 3, 0}) -- x will be 1 because 700 > 699 |
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Example 4: |
x = compare(’a’, "a") -- x will be -1 because ’a’ is an atom -- while "a" is a sequence |
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Implementation: | Implemented as %opScmp in builtins\VM\pJcc.e (an autoinclude) - be warned however it is low-level complicated stuff that you do not need to know, as hinted by example 3 above things can get very messy digging ever deeper into nested sequences looking for the first discrepancy. sq_cmp() is implemented in builtins\psqop.e | ||||||
See Also: | equal, min, max, relational operators, sequence operations |