Javascript for 循环条件

Question

我正在阅读可汗学院的算法类(class)。我在https://www.khanacademy.org/computing/computer-science/algorithms/insertion-sort/p/challenge-implement-insert .

After calling the insert function: * value and the elements that were previously in array[0] to array[rightIndex], should be sorted in ascending order and stored in the elements from array[0] to array[rightIndex+1]. In order to do this, the insert function will need to make room for value by moving items that are greater than value to the right. It should start at rightIndex, and stop when it finds an item that is less than or equal to value, or when it reaches the beginning of the array. Once the function has made room for value, it can write value to the array.

我的尝试是:

var insert = function(array, rightIndex, value) {

var i = rightIndex;
    for( array[i]> key ; 0; i-- ) {

        array[i + 1] = array[i]; 
   } 
   array[i]= value;

};

var array = [3, 5, 7, 11, 13, 2, 9, 6];

insert(array, 4, 2);
println("Array after inserting 2:  " + array);

他们明确表示他们想要在 for 循环中添加一个条件，但我不知道该怎么做。

Answer 1

 var insert = function(array, rightIndex, value) {
    // for( initial_value; condition; change the value for next iteration)
    // && - returns true only when both are true.
     for(var j = rightIndex; j >= 0 && array[j] > value; j--) {
        array[j + 1] = array[j];
    }
    array[j + 1] = value; 

};