Original code in JS:
// applying crossover
for (let i = cxpoint1; i < cxpoint2; i++) {
let temp1 = ind1[i]
let temp2 = ind2[i]
ind1[i] = temp2
ind1[p1[temp2]] = temp1
ind2[i] = temp1
ind2[p2[temp1]] = temp2
return [ind1, ind2]New to JS and wondering what is happening on this line:
ind1[p1[temp2]] = temp1Trying to understand so I can make an equivalent function in Python.
I understand the assignment, however obviously in Python you cannot use double brackets as shown on the line above. If someone could tell me the concept, I should be able to apply it to my situation.
Thanks in advance.
There's nothing magical going on here.
ind1[p1[temp2]]
p1[temp2] resolves to some value, let's call it a. So the expression then becomes ind1[a].
To fully understand the code one would need to know how the arrays p1 and p2 look like, but I assume they are integer-arrays. You select an integer from that array in the inner statement that then is the index for the outer statement.
It works exactly the same in python:
ind1 = [1, 2, 3, 4, 5]
p1 = [3, 1, 2]
print(ind1[p1[0]])
# -> 4
In this example the inner statement resolves to 3 (first element in the p1-list) and the outer statement then resolves to 4 (fourth element in the ind1-list.