How to get the arrays inside an array which is in the form of string using javascript

Question

I am pretty new to java and javascript and I have a problem.

I have an array in the form of a string which looks like below in javascript.

[[0,'Apple','Banana'],['The Apple fruit, comes from Apple Tree', 'The Banana fruit, comes from Banana Tree']]

In this, I need to get the first array [0,'Apple','Banana'] and save it as a separate array and then I need to get the second array ['The Apple fruit, comes from Apple Tree', 'The Banana fruit, comes from Banana Tree'] and display it as a text in text area like this.

The Apple fruit, comes from Apple Tree
The Banana fruit, comes from Banana Tree

How can I achieve this in javascript?

Please need some help as I have googled about this problem intensively.

Thanks in advance.

eval this string so it will be converted to array. Then you can easily access. — Jay Shukla
– Jay Shukla, Commented Jul 19, 2013 at 7:43
No - don't eval it - it's seriously bad practice and it's not necessary. — user1864610
– user1864610, Commented Jul 19, 2013 at 7:47
@ShuklaJay - Depending on where the string value comes from, using eval can be very unsafe. Much better to use JSON.parse(string) to turn this into an array. — Ted Hopp
– Ted Hopp, Commented Jul 19, 2013 at 7:47

Joe Beuckman · Accepted Answer · 2013-07-19 07:44:39Z

3

You can use var arr = JSON.parse(str) to convert your string to a Javascript array. Then access the members of the array nomrally, eg. arr[0]

answered Jul 19, 2013 at 7:44

Joe Beuckman

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mohkhan · Accepted Answer · 2013-07-19 07:45:28Z

1

You can do something like this if you have a string.

var arr = JSON.parse("[[0,'Apple','Banana'],['The Apple fruit, comes from Apple Tree', 'The Banana fruit, comes from Banana Tree']]");

var seprateArr = arr[0];

var text = arr[1].join(" ");

answered Jul 19, 2013 at 7:45

mohkhan

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2 Comments

Vasanth Rajasekaran Over a year ago

I tried this but it seems JSON doesn't work. My javascript code stops on the line var arr = JSON.parse("[[0,'Apple','Banana'],['The Apple fruit, comes from Apple Tree', 'The Banana fruit, comes from Banana Tree']]");

mohkhan Over a year ago

YOu can use

eval("("[[0,'Apple','Banana'],['The Apple fruit, comes from Apple Tree', 'The Banana fruit, comes from Banana Tree']]")")

instead of JSON.parse, but I would not recommend it if your data is not from a trusted source.

PA. · Accepted Answer · 2013-07-19 07:49:43Z

1

"looks like below in javascript" means you have an array of strings to me.

in the case you have this

var myarray = [
           [0,'Apple','Banana'],
           ['The Apple fruit, comes from Apple Tree', 
            'The Banana fruit, comes from Banana Tree']
          ];

just assign the array to a variable

var first = myarray[0];

for the second problem, use .join() method of arrays

var second = myarray[1].join(' ');

or in case you have

var mystring = "[[0,'Apple','Banana'],['The Apple fruit, comes from Apple Tree', 'The Banana fruit, comes from Banana Tree']]";

then you'll need to convert to array first.

var myarray = JSON.parse(mystring);

edited Jul 19, 2013 at 7:49

answered Jul 19, 2013 at 7:44

PA.

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1 Comment

Ted Hopp Over a year ago

OP said that the data was in the form of a string.

Hemant_Negi · Accepted Answer · 2013-07-19 07:50:42Z

0

Try this

var a =eval("[[0,'Apple','Banana'],['The Apple fruit, comes from Apple Tree', 'The Banana fruit, comes from Banana Tree']]");
var b = a[0];
var c = a[1];

now b and c are your new arrays;

you can also use the above method mentioned by mohkhan but it is not a valid json; if you have a valid JSON string then above one will be the preferred methos

answered Jul 19, 2013 at 7:50

Hemant_Negi

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