Javascript：将数组值与变量进行比较

Question

In my program I have to compare array values to a variable, but it looks like my array is only comparing the last value to the variable. How should I proceed to compare all of them?

Here is the code:

for(var n=0; n<arrayLength; n++) {
    console.log(occupiedArray[n][0]);
    if(occupiedArray[n][0] == clickedX  && occupiedArray[n][1] == clickedY ) {
        occupied = true;
    } else {
        occupied = false;
    }
}

And here is my array :

var occupiedArray = [[4,0],
                     [5,0],
                     [6,0]];

When I use console.log it displays 4,5,6 just like I wanted, but it's only comparing the '6' value to my variable 'clickedX'. Any idea?

Thanks

Answer 1

You're overwriting the value of occupied each iteration so only the most recent comparison is reflected at the end of the loop. Instead, try this:

for(var n=0; n<arrayLength; n++) {
    console.log(occupiedArray[n][0]);
    if(occupiedArray[n][0] == clickedX  && occupiedArray[n][1] == clickedY ) {
        occupied = true;
    }
}

Here occupied can be set to true but once true can never return to false.

Answer 2

maybe..

occupied = false;
for(var n=0; n<arrayLength; n++) {
    if((occupiedArray[n][0] == clickedX)  && (occupiedArray[n][1] == clickedY) ) {
        occupied = true;
        break;
    }
}

if occupied found, exit loop