Using a variable as part of an object?

Question

Say you have the variable, the reason I ask if it is possible to use a variable is if I were to use an input to dynamically change the var:

var str = "pineapples"
var cost = {
pineapples: "free",
apples: "£1"
}

how would it be possible to use it as an object name

document.getElementById("result").innerHTML=cost.??

Possible duplicate

ajp15243
– ajp15243

2013-12-30 14:25:55 +00:00
Commented Dec 30, 2013 at 14:25 — ajp15243
– ajp15243, Commented Dec 30, 2013 at 14:25

WebServer · Accepted Answer · 2013-12-30 14:26:28Z

4

in js if variable is objects property name then [] brackets should be used

cost[str]

answered Dec 30, 2013 at 14:26

WebServer

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Comments

Phil · Accepted Answer · 2013-12-30 14:44:47Z

-1

Simple, add the string to the object:

cost[ str ] = inputString;

than retrieve it after:

document.getElementById("result").innerHTML = cost.str;

answered Dec 30, 2013 at 14:44

Phil

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3 Comments

ajp15243 Over a year ago

Using cost.str will attempt to find a property literally called str in the cost object.

Phil Over a year ago

I am confused. what is the OP looking for than?

ajp15243 Over a year ago

The OP doesn't appear to know about bracket notation on objects, so that is what s/he is looking for. Your answer would be correct if you retrieved the value via cost[str] (looks for a property whose name is the value of str) rather than via cost.str (looks for a property whose name is literally str).

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