I'm currently reviewing the descending number sorting code below and I'm feeling a bit confused:
var points = [40, 100, 1, 5, 25, 10];
points.sort(function(a, b){return b - a});
In the given code, the return value will be (b-a), for example, 100 - 40 = 60. However, there is no 60 in the array provided.
Sorting Implementation from Mozilla -
If compareFunction(a, b) results in a value less than 0, then sort a to a lower index than b, placing a first.
If compareFunction(a, b) returns 0, maintain the position of a and b relative to each other but ensure they are sorted with respect to all other elements. Note: Some browsers may not follow this behavior due to ECMAscript standards.
You can observe the functionality of the function by adding logging statements.
var points = [40, 100, 1, 5, 25, 10];
points.sort(function(a, b){
console.log("a = " + a +
": b= " + b +
": b - a = " + (b - a) +
" swap a and b if b-a > 0");
return b - a});
Output -
a = 40: b= 100: b - a = 60 swap a and b if b-a > 0
a = 40: b= 1: b - a = -39 swap a and b if b-a > 0
a = 1: b= 5: b - a = 4 swap a and b if b-a > 0
a = 40: b= 5: b - a = -35 swap a and b if b-a > 0
a = 1: b= 25: b - a = 24 swap a and b if b-a > 0
a = 5: b= 25: b - a = 20 swap a and b if b-a > 0
a = 40: b= 25: b - a = -15 swap a and b if b-a > 0
a = 1: b= 10: b - a = 9 swap a and b if b-a > 0
a = 5: b= 10: b - a = 5 swap a and b if b-a > 0
a = 25: b= 10: b - a = -15 swap a and b if b-a > 0
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