comparison-operators

I was just debugging a script and found that an if-statement wasn't working the way I expected it to. var_dump("6064365413078728979" == "6064365413078728452"); die(); The code above will result in the following: bool(true) With the === operator it works as expected. Anyone got any ideas why? I'm using PHP Version 5.3.13 with a wamp installation on a x64 windows machine. Hanky Panky <?php $a=6064365413078728979; $b=6064365413078728452; echo $a."<br>".$b; //var_dump( $a==$b ); die(); ?> When you run that, then on your machine that might be exceeding limit for a number and that is a numeric

Context While I was reading Consistent comparison , I have noticed a peculiar usage of the verb to compare : There’s a new three-way comparison operator, <=> . The expression a <=> b returns an object that compares <0 if a < b , compares >0 if a > b , and compares ==0 if a and b are equal/equivalent. Another example found on the internet (emphasis mine): It returns a value that compares less than zero on failure. Otherwise, the returned value can be used as the first argument on a later call to get. One last example , found in a on GitHub (emphasis mine): // Perform a circular 16 bit compare.

Beginning programmer here, just wanting to understand the process behind Ruby's sort method when using the spaceship operator <=> . Hope someone can help. In the following: array = [1, 2, 3] array.sort { |a, b| a <=> b } ... I understand that sort is comparing a pair of numbers at a time and then returning -1 if a belongs before b , 0 if they're equal, or 1 if a should follow b . But in the case of sorting in descending order, like so: array.sort { |a, b| b <=> a } ... what exactly is happening? Does sort still compare a <=> b and then flip the result? Or is it interpreting the return s of -1

Ruby has something called a Combined Comparison or "Spaceship" Operator, it looks like this: <=> It does the following: a <=> b := if a < b then return -1 if a = b then return 0 if a > b then return 1 Credit Is there a similar Operator in Javascript? If not, how can I end up with the same result? @madox2 suggested using Math.sign(a - b) , which works for number, but not arrays (to compare arrays you need to use array.length ). It also does not work in Internet Explorer, Safari or all Mobile Browsers (see MDN ) @duques_l found a function here . It works very well, you can test it on JSFiddle