loop string in each object to one string

Question

How to loop string in each object add to one string like below result?
I need to add each variable this_encode to one string, how to do it?

result: '<img src=""><iframe></iframe><img src="">'

for (var key in obj) {
    if (obj[key].file_type == 0) {
        var this_encode = '<img src="' + obj[key].file_name + obj[key].file_format + '">';
    } else if(obj[key].file_type == 1) {
        var this_encode = '<iframe width="150" height="100" src="'+obj[key].file_embed_url +'" frameborder="0" allowfullscreen></iframe>';
    }
}

obj

file_embed_url: ""  
file_format: "jpg"  
file_name: "53b21c90dded9"  
file_sequence: "0"  
file_type: "0"  
gallery_id: "1"  
id: "138"  

file_embed_url: "//www.youtube.com/embed/-x6jzKpqeuw"  
file_format: ""  
file_name: ""  
file_sequence: "1"  
file_type: "1"  
gallery_id: "1"  
id: "139"  

...

declare your string outside the loop and then use concatenation to create a single string. — jasonscript
– jasonscript, Commented Jul 1, 2014 at 2:45
@AdamMerrifield obj is javascript object like above example — user1775888
– user1775888, Commented Jul 1, 2014 at 2:49
@user1775888 declare this_encode before you start the for. So it would be var this_encode = ''; then for (var key in obj) {. Inside the for just replace var this_encode = with this_encode += . — Adam Merrifield
– Adam Merrifield, Commented Jul 1, 2014 at 2:52

jasonscript · Accepted Answer · 2014-07-01 02:54:21Z

Declare your this_encode variable outside the loop and then use concatenation to create a single string

// first initialise your variable as an empty string; can't concatenate to undefined
var this_encode = '';

// Now run your code as before with 2 small differences
//      (1) Remove the var declarations
//      (2) Use += instead of = to indicate that you want to append the following text to the this_encode variable
for (var key in obj) {
    if (obj[key].file_type == 0) {
        this_encode += '<img src="' + obj[key].file_name + obj[key].file_format + '">';
    //  ^           ^ see the change here
    //  |
    //  var declartion removed from here (and below)
    } else if(obj[key].file_type == 1) {
        this_encode += '<iframe width="150" height="100" src="'+obj[key].file_embed_url +'" frameborder="0" allowfullscreen></iframe>';
        //          ^ and here
    }
}

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