How do I combine 2 javascript variables into a string

Question

I would like to join a js variable together with another to create another variable name... so it would be look like;

for (i=1;i<=2;i++){
    var marker = new google.maps.Marker({
position:"myLatlng"+i,
map: map, 
title:"title"+i,
icon: "image"+i
}); 
}

and later on I have

myLatlng1=xxxxx;
myLatlng2=xxxxx;

Answer 1

Use the concatenation operator +, and the fact that numeric types will convert automatically into strings:

var a = 1;
var b = "bob";
var c = b + a;

Answer 2

ES6 introduce template strings for concatenation. Template Strings use back-ticks (``) rather than the single or double quotes we're used to with regular strings. A template string could thus be written as follows:

// Simple string substitution
let name = "Brendan";
console.log(`Yo, ${name}!`);

// => "Yo, Brendan!"

var a = 10;
var b = 10;
console.log(`JavaScript first appeared ${a+b} years ago. Crazy!`);

//=> JavaScript first appeared 20 years ago. Crazy!