Iterate through an array and concatenate another array all the values before next iteration of first array?

Question

I'm trying to build a list of Urls. The structure is like this: http://somedomain.com/game_CATEGORY?page=NUMBER.

I have an array of game categories, ranging from action games category to word games category.

I have an array of numbers, 1 through 20.

I have pieces of the url saved as strings.

I've been trying for a day to combine them in this way:

cats = ["action","adventure","arcade","board","card","casino","casual","educational","family","music","puzzle","racing","role_playing","simulation","sports","strategy","trivia","word"],
nums = [1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20],
urlString1 = "http://example.com/game_",
urlString2 = "?page=",
madeUrl1 = [],
x = 1, // counter for page numbers
madeUrl2 = [];

for (var i = 0; i < cats.length; i++) {
    madeUrl1.push(urlString1+cats[i]+urlString2);
};


for (var i = 0; i < madeUrl1.length; i++) {
    madeUrl2.push(madeUrl1[i]+x);
    x++;
};
console.log(madeUrl2);

This gets me partially there. But its printing out one number per category. I need each category printout to have ALL 20 numbers added, then move on to the next category.

Mike Paxton · Accepted Answer · 2015-11-05 18:53:40Z

1

You'd need to nest another for loop inside your second one. Something like:

for (var i = 0; i < madeUrl1.length; i++) {
    for (int j = 0; j < nums.length; j++) {
        madeUrl2.push(madeUrl1[i]+nums[j]);
    }
};

That way you're iterating through the base URLs you prepared in madeUrl1, and then for each of those you're iterating through each number you have in the array.

If the numbers are simply sequential from 1 to 20, you don't even need the nums array:

for (var i = 0; i < madeUrl1.length; i++) {
    for (var x = 1; x <= 20; x++) {
        madeUrl2.push(madeUrl1[i]+x);
    }
};

And the whole thing could be accomplished with a single nested for loop:

for (var i = 0; i < cats.length; i++) {
    for (var x = 1; x <= 20; x++) {
        madeUrl1.push(urlString1+cats[i]+urlString2+x);
    }
};

answered Nov 5, 2015 at 18:53

Mike Paxton

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1 Comment

EasyCodeTime Over a year ago

Nice. That's what I tried yesterday but I kept thinking I needed to return a value from the first loop in order to let the second loop get its data. Thanks for showing me the proper way. Wish I could've figure that out on my own!

Amar Syla · Accepted Answer · 2015-11-05 18:54:41Z

0

You can use the code below:

cats = ["action","adventure","arcade","board","card","casino","casual","educational","family","music","puzzle","racing","role_playing","simulation","sports","strategy","trivia","word"],
nums = [1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20],
urlString1 = "http://example.com/game_",
urlString2 = "?page=",
madeUrl1 = [],
x = 1;

for (var i = 0; i < cats.length; i++) {
    for (var j = 0; j < nums.length; j++) {
        madeUrl1.push(urlString1+cats[i]+urlString2+nums[j]);
        x++;
    };
};

console.log(madeUrl1);

What we did here, is first nesting our loops. E.g., it will first loop through the first array, and when it arrives at it first item, in this case a category, it will run the nested loop 20 times, appending each number to the page. After done, it continues to the second category and so on.

answered Nov 5, 2015 at 18:54

Amar Syla

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2 Comments

EasyCodeTime Over a year ago

Damn, nesting was the first thing I tried, but I didn't have it set up properly. Thanks.

Amar Syla Over a year ago

Glad I could help you. If this is a correct answer for you, please use the check icon on top of this answer to mark it as correct, and/or vote it up. Cheers.

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