convert String to array in javascript "datastatusMonthly[0]"

Question

datastatusMonthly[0] - This is my String in javascript If i print this, it is printing as same string.

How do i get the value of '0' index in array datastatusMonthly using this above string?

Any help please?

Don't use a string? Please include some indication of how you're using this code, where it comes from, etc. Context will help determine the best option to use. — Heretic Monkey, Jun 30 '17 at 13:32
Do you want the answer to work for only that specific string? A string in the form datastatusMonthly[#] where # could be any number? could the array have multiple entries? ie datastatusMonthly[#, #, #]. Please be a little more specific about the possible range of inputs. — Marjorie Pickard, Jun 30 '17 at 13:35

score 2 · Answer 1 · answered Jun 30 '17 at 13:32

2

You can use eval. The eval function will evaluate your string. JS bin here https://jsbin.com/guqoqukoqa/edit?js,console

answered Jun 30 '17 at 13:32

Titouan56

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Alberto Trindade Tavares · Accepted Answer · 2017-07-02T10:48:33.690

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Solution without eval, which is evil, using regex with group:

var datastatusMonthly = [3];

var text = 'datastatusMonthly[0]';
var regex = /(datastatusMonthly)\[([0-9]+)\]/g;
var match = regex.exec(text);

var arrayName = match[1];
var arrayIndex = match[2];

console.log(window[arrayName][arrayIndex]);

edited Jul 02 '17 at 10:48

answered Jun 30 '17 at 13:43

Alberto Trindade Tavares

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this works and even 'eval' also works correctly, but i not understood why 'eval' is evil. – Saiprakash Holi Jul 02 '17 at 10:47
There are tons of reasons. See the answers for that post: https://stackoverflow.com/questions/86513/why-is-using-the-javascript-eval-function-a-bad-idea – Alberto Trindade Tavares Jul 02 '17 at 10:48
The biggest one might be performance! The solution with `eval` is slower than that one I gave, but there are also a lot of security issues – Alberto Trindade Tavares Jul 02 '17 at 10:50

score 0 · Answer 3 · answered Jun 30 '17 at 13:48

0

This dose't have to be in a String i guess. correct me if i am not understanding it properly var fistElement = datastatusMonthly[0]; This link might help https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array#Accessing_array_elements

answered Jun 30 '17 at 13:48

amittn

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var firstElement = "datastatusMonthly[0]" , this is the string – Saiprakash Holi Jul 02 '17 at 10:45

convert String to array in javascript "datastatusMonthly[0]"

3 Answers3