Convert javascript array to string

Question

I\'m trying to iterate over a \"value\" list and convert it into a string. Here is the code:

var blkstr = $.each(value, function(idx2,val2) {                        


        

Answer 1

Array.prototype.toString()

The toString() method returns a string representing the specified array and its elements.

var months = ["Jan", "Feb", "Mar", "Apr"];
months.toString(); // "Jan,Feb,Mar,Apr"

Syntax

arr.toString()

Return value

A string representing the elements of the array.

for more information :

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/toString

Answer 2

jQuery.each is just looping over the array, it doesn't do anything with the return value^∆. You are looking for jQuery.map (I also think that get() is unnecessary as you are not dealing with jQuery objects):

var blkstr = $.map(value, function(val,index) {                    
     var str = index + ":" + val;
     return str;
}).join(", ");  

DEMO

---

But why use jQuery at all in this case? map only introduces an unnecessary function call per element.

var values = [];

for(var i = 0, l = value.length; i < l; i++) {
    values.push(i + ':' + value[i]);
}

// or if you actually have an object:

for(var id in value) {
    if(value.hasOwnProperty(id)) {
        values.push(id + ':' + value[id]);
    }
}

var blkstr = values.join(', ');

---

∆: It only uses the return value whether it should continue to loop over the elements or not. Returning a "falsy" value will stop the loop.

Answer 3

I needed an array to became a String rappresentation of an array I mean I needed that

var a = ['a','b','c'];
//became a "real" array string-like to pass on query params so was easy to do:
JSON.stringify(a); //-->"['a','b','c']"

maybe someone need it :)

Answer 4

convert an array to a GET param string that can be appended to a url could be done as follows

function encodeGet(array){
    return getParams = $.map(array , function(val,index) {                    
        var str = index + "=" + escape(val);
        return str;
   }).join("&");
}

call this function as

var getStr = encodeGet({
    search:     $('input[name="search"]').val(),
    location:   $('input[name="location"]').val(),
    dod:        $('input[name="dod"]').val(),
    type:       $('input[name="type"]').val()
});
window.location = '/site/search?'+getStr;

which will forward the user to the /site/search? page with the get params outlined in the array given to encodeGet.

Answer 5

not sure if this is what you wanted but

var arr = [A, B, C];
var arrString = arr.join(", ");

This results in the following output:

A, B, C

Answer 6

Four methods to convert an array to a string.

Coercing to a string

var arr = ['a', 'b', 'c'] + [];  // "a,b,c"

var arr = ['a', 'b', 'c'] + '';  // "a,b,c"

Calling .toString()

var arr = ['a', 'b', 'c'].toString();  // "a,b,c"

Explicitly joining using .join()

var arr = ['a', 'b', 'c'].join();  // "a,b,c" (Defaults to ',' seperator)

var arr = ['a', 'b', 'c'].join(',');  // "a,b,c"

You can use other separators, for example, ', '

var arr = ['a', 'b', 'c'].join(', ');  // "a, b, c"

Using JSON.stringify()

This is cleaner, as it quotes strings inside of the array and handles nested arrays properly.

var arr = JSON.stringify(['a', 'b', 'c']);  // '["a","b","c"]'