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Can I implode an array in jQuery like in PHP?

John
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Omega
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7 Answers7

602

You can do this in plain JavaScript, use Array.prototype.join:

arrayName.join(delimiter);
John
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jon_darkstar
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72

Like This:

[1,2,3,4].join('; ')
mikerobi
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28

Array.join is what you need, but if you like, the friendly people at phpjs.org have created implode for you.

Then some slightly off topic ranting. As @jon_darkstar alreadt pointed out, jQuery is JavaScript and not vice versa. You don't need to know JavaScript to be able to understand how to use jQuery, but it certainly doesn't hurt and once you begin to appreciate reusability or start looking at the bigger picture you absolutely need to learn it.

scrowler
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nikc.org
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19

For future reference, if you want to mimic the behaviour of PHP's implode() when no delimiter is specified (literally just join the pieces together), you need to pass an empty string into Javascript's join() otherwise it defaults to using commas as delimiters:

var bits = ['H', 'e', 'l', 'l', 'o', ' ', 'W', 'o', 'r', 'l', 'd'];
alert(bits.join());    // H,e,l,l,o, ,W,o,r,l,d
alert(bits.join(''));  // Hello World
scrowler
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12

Use join() method creates and returns a new string by concatenating all of the elements in an array.

Working example

var arr= ['A','b','C','d',1,'2',3,'4'];
var res= arr.join('; ')
console.log(res);
Deepu Reghunath
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0

We can create alternative of implode of in javascript:

function my_implode_js(separator,array){
       var temp = '';
       for(var i=0;i<array.length;i++){
           temp +=  array[i] 
           if(i!=array.length-1){
                temp += separator  ; 
           }
       }//end of the for loop

       return temp;
}//end of the function

var array = new Array("One", "Two", "Three");


var str = my_implode_js('-',array);
alert(str);
Vijay Verma
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    Textbook case of things not to do. Do not perform string concatenation in a loop. Do not replace fast built in functions with your own slow code. Using the `Array` constructor instead of literals is unecessarily verbose. If you are desperate to recreate the implode function the smart thing would be to wrap the built in join method with your own function. The smarter thing is to learn the language you are programming in. – mikerobi Apr 17 '13 at 14:35
0

array.join was not recognizing ";" how a separator, but replacing it with comma. Using jQuery, you can use $.each to implode an array (Note that output_saved_json is the array and tmp is the string that will store the imploded array):

var tmp = "";
$.each(output_saved_json, function(index,value) {
    tmp = tmp + output_saved_json[index] + ";";
});

output_saved_json = tmp.substring(0,tmp.length - 1); // remove last ";" added

I have used substring to remove last ";" added at the final without necessity. But if you prefer, you can use instead substring something like:

var tmp = "";
$.each(output_saved_json, function(index,value) {
    tmp = tmp + output_saved_json[index];

    if((index + 1) != output_saved_json.length) {
         tmp = tmp + ";";
    }
});

output_saved_json = tmp;

I think this last solution is more slower than the 1st one because it needs to check if index is different than the lenght of array every time while $.each do not end.

eduardomozart
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  • If you were getting a ',' instead of a ';' you were forgetting to pass the delimiter in to the join method. Try `your_array.join(';')` – mikerobi Apr 17 '13 at 14:40
  • I tried it in that time but it didn't work in IE (I do not remember the version exact, but I think that was IE6). I needed to support it in that time (Enterprise app...). In newers browsers your note probably make sense. Thanks for the note Mike and thanks for downvote BEFORE asking WHY I have used this method. – eduardomozart Apr 22 '13 at 16:26
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    The join parameter works in IE 4, 5, 5.5, 6+. I't might have worked in IE3 but I can't get my copy to execute any JavaScript, so I can't test. – mikerobi Apr 22 '13 at 18:06
  • Yes, it works. But not with ";". It join but replaces ";" with ",", at least on Server 2003. – eduardomozart May 20 '13 at 15:36