How to join two variables to log another variable

Question

I have two variables that I need to join and then print the value of a different variable which has the name of the variables I just joined.

I have:

var NoQ = "1234, 4321, 6789"

var NoQ1 = "Number: " + NoQ.slice(0,4);
var NoQ2 = "Number: " + NoQ.slice(5,9);

var i = 1 //i is in a for loop so i++

console.log(NoQ+i)  
//prints 1234, 4321, 67891

I want NoQ and i to join to technically become NoQ1 before logging.

Expected output: Number: 1234

How do I achieve this?

Any help is appreciated.

But `NoQ` is `"1234, 4321, 6789"`, so shouldn't the output be: `"number: 1234, 4321, 6789"` ? — nick zoum, Feb 28 '19 at 09:30
No, because I want it to print `NoQ1` but joined `NoQ` and `i`. — JackU, Feb 28 '19 at 09:31
Can you please post the full output you're expecting? It's unclear what you're asking. Do you want to split based on `,`? — adiga, Feb 28 '19 at 09:32
Can you try and rewrite this question, it's not making much sense at the moment e.g. `to join to technically become` what do you mean `technically`? — StudioTime, Feb 28 '19 at 09:34
Are you aware `console.log` can take several parameters which will be printed in row ? `console.log('one', 'two', 'three', 'four') // one two three four` — samb102, Feb 28 '19 at 09:36

score 2 · Accepted Answer · answered Feb 28 '19 at 09:32

Better to use an Array for ordered items and return the value with an index.

The wanted type is not possible to get a variable in a variable for accessing a value.

var noQ = "1234, 4321, 6789",
    noQs = noQ.split(/,\s*/g).map(s => `Number: ${s}`);

console.log(noQs[0]);

score 0 · Answer 2 · answered Feb 28 '19 at 09:33

0

Something like this ?

var NoQ = "1234, 4321, 6789";

var i = 1;

console.log('Number: ' + NoQ.split(', ')[i]);

answered Feb 28 '19 at 09:33

Tristan De Oliveira

800
4
12

score 0 · Answer 3 · answered Feb 28 '19 at 09:35

You can access global variables on window so you can use array access syntax to access those variables with a string value:

var NoQ = "1234, 4321, 6789"

var NoQ1 = "Number: " + NoQ.slice(0,4);
var NoQ2 = "Number: " + NoQ.slice(5,9);

var i = 1 //i is in a for loop so i++

for (let i = 1; i <= 2; ++i)
  console.log(window['NoQ' + i])

score 0 · Answer 4 · answered Feb 28 '19 at 09:36

Use a template string to build your output string and string.split() with a regex to split your input string on the commas and get rid of the extra space:

const NoQ = "1234, 4321, 6789"

const NoQi = i => `Number: ${NoQ.split(/,\s*/)[i - 1]}`

console.log(NoQi(1))
console.log(NoQi(2))
console.log(NoQi(3))

JohnPan · Answer 5 · 2019-02-28T09:53:50.007

-2

Try console.log(window['NoQ'+i]) NOT the best solution, but it is the closest to what you are trying to do.

edited Feb 28 '19 at 09:53

answered Feb 28 '19 at 09:33

JohnPan

1,185
11
21

How to join two variables to log another variable

5 Answers5