Convert javascript array to string

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) {                    
     var str = idx2 + ":" + val2;
     alert(str);
     return str;
}).get().join(", ");    

alert() function works just fine and displays the proper value. But somehow, jquery's .get() function doesn't get the right sort of object and fails. What am I doing wrong?

If value is not a plain array, such code will work fine:

var value = { "aaa": "111", "bbb": "222", "ccc": "333" };
var blkstr = [];
$.each(value, function(idx2,val2) {                    
  var str = idx2 + ":" + val2;
  blkstr.push(str);
});
console.log(blkstr.join(", "));

<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.7.1/jquery.min.js"></script>

(output will appear in the dev console)

As Felix mentioned, each() is just iterating the array, nothing more.

Converting From Array to String is So Easy !

var A = ['Sunday','Monday','Tuesday','Wednesday','Thursday']
array = A + ""

That's it Now A is a string. :)

You can use .toString() to join an array with a comma.

var array = ['a', 'b', 'c'];
array.toString(); // result: a,b,c

Or, set the separator with array.join('; '); // result: a; b; c.

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

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"]'

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.

Use join() and the separator.

Working example

var arr = ['a', 'b', 'c', 1, 2, '3'];

// using toString method
var rslt = arr.toString(); 
console.log(rslt);

// using join method. With a separator '-'
rslt = arr.join('-');
console.log(rslt);

// using join method. without a separator 
rslt = arr.join('');
console.log(rslt);

this's my function, convert object or array to json

function obj2json(_data){
	str = '{ ';
	first = true;
	$.each(_data, function(i, v) { 
		if(first != true)
			str += ",";
		else first = false;
		if ($.type(v)== 'object' )
			str += "'" + i + "':" + obj2arr(v) ;
		else if ($.type(v)== 'array')
			str += "'" + i + "':" + obj2arr(v) ;
		else{
			str +=  "'" + i + "':'" + v + "'";
		}
	});
	return str+= '}';
}

i just edit to v0.2 ^.^

 function obj2json(_data){
	str = (($.type(_data)== 'array')?'[ ': '{ ');
	first = true;
	$.each(_data, function(i, v) { 
		if(first != true)
			str += ",";
		else first = false;
		if ($.type(v)== 'object' )
			str += '"' + i + '":' + obj2json(v) ;
		else if ($.type(v)== 'array')
			str += '"' + i + '":' + obj2json(v) ;
		else{
			if($.type(_data)== 'array')
				str += '"' + v + '"';
			else
				str +=  '"' + i + '":"' + v + '"';
		}
	});
	return str+= (($.type(_data)== 'array')? ' ] ':' } ');;
}

var arr = new Array();

var blkstr = $.each([1, 2, 3], function(idx2,val2) {                    
    arr.push(idx2 + ":" + val2);
    return arr;
}).join(', ');

console.log(blkstr);

OR

var arr = new Array();

$.each([1, 2, 3], function(idx2,val2) {                    
    arr.push(idx2 + ":" + val2);
    
});

console.log(arr.join(', '));

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 :)

const myArray=["hello",4,"programming"];
console.log(myArray.join(''));//hello4programming

We can use the join function for converting

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.

You shouldn't confuse arrays with lists.

This is a list: {...}. It has no length or other Array properties.

This is an array: [...]. You can use array functions, methods and so, like someone suggested here: someArray.toString();

someObj.toString(); will not work on any other object types, like lists.

>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

Here's an example using underscore functions.

var exampleArray = [{name: 'moe', age: 40}, {name: 'larry', age: 50}, {name: 'curly', age: 60}];
var finalArray = _.compact(_.pluck(exampleArray,"name")).join(",");

Final output would be "moe,larry,curly"

If you are looking for the first member to extract or the array has just one member, do this:

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

we can use the function join() to make the string from the array, and as parameter of function join we giv it '' empty character.

var newStr =mArray.join('');