Defining a function inside of a loop can yield unexpected results. Such a function keeps references to the variables which are defined in outer
scopes. All function instances created inside the loop therefore see the same values for these variables, which is probably not expected.
Noncompliant Code Example
var funs = [];
for (var i = 0; i < 13; i++) {
funs[i] = function() { // Non-Compliant
return i;
};
}
console.log(funs[0]()); // 13 instead of 0
console.log(funs[1]()); // 13 instead of 1
console.log(funs[2]()); // 13 instead of 2
console.log(funs[3]()); // 13 instead of 3
...
