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Ireneusz Kopta
6,212 PointsProblem
NumArray.sort(function(a-b){ return a-b; }); lessons about arrays method - part 2. How exactly this function works? Cant understand how this function sort numbers in order. if I got array of numbers NumArray=[6,2,7,1,3,7]; How that function put them in order.In my mind if you subtract 2 from 6 you got 4.and so on That its obvious But how does it arrange numbers in order after subtraction?
4 Answers
Cherie Burgett
8,711 Pointsalright I'll try and take annother stab at it. So 6-2 = 4 poisitve value means 6 comes after 2 in the sort order. 6-7= -1, six gets moved to before the 7. sort compares the values of a and b, a and be are any of the numbers within your array. It will compare all of the numbers between each other individually and move them either up or down depending on if they return a negaive number or a positive number.
Cherie Burgett
8,711 Pointssorts are run by comparison, if a negative number is returned it is pushed to the front. Is the best way I could explain it. alternatively I believe return a > b ? 1 : a < b ? -1 : 0 would also work to sort an array of numbers.
Ireneusz Kopta
6,212 Pointsjust wonder how the arguments are passed in to function. it takes first two variables and moves em to arguments. Negative number is pushed to the front.Then what? What about the rest of variables.I would like to know the inside process.Sorry I really like to dig what I learn.
Ireneusz Kopta
6,212 PointsI was thinking about values ofc :) Thank you for answer!