Question

171

access variable from outside loop

rated 0 times [ 175] [ 4] / answers: 1 / hits: 16575 / 7 Years ago, sat, november 18, 2017, 12:00:00

I know that this is fundamental JS, but I'd like a simple explanation. From what I've read, If i declare an empty variable outside of my loop, the variable inside the loop should be accessible globally? Or am I totally wrong?

I would like to access randAd from outside my for loop.

var mobileAds = [

    mobile/bb.jpg,

    mobile/eyeko.jpg,

    mobile/farfetch.jpg,

    mobile/fsb.jpg

];



var randNum = (Math.floor(Math.random() * mobileAds.length));

var randAd;



var i;

for (i = 0; i < mobileAds.length; ++i) {

    randAd = (mobileAds[randNum]);

}

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malkajillc

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3 Years ago

answered 7 Years ago quentinaveryb · Accepted Answer

If you want to access every element of randAd outside the for loop try like this var randAd = []; to initialize it as an array. You can easily access it after your for loop but If you use it as a simple variable var randAd;then you'll get the last variable always (it overwrites). So initialize it as an array and push every element inside loop before outputting it.

var mobileAds = [

        mobile/bb.jpg,

        mobile/eyeko.jpg,

        mobile/farfetch.jpg,

        mobile/fsb.jpg

    ];

    

var randNum = (Math.floor(Math.random() * mobileAds.length));

var randAd = []; // see the change here

    

var i;

for (i = 0; i < mobileAds.length; ++i) {

    randAd.push(mobileAds[randNum]); // push every element here

}

console.log(randAd);