I have a simple simulated array with two elements:
bowl["fruit"] = "apple";
bowl["nuts"] = "brazilian";
I can access the value with an event like this:
onclick = "testButton00_('fruit')">with `testButton00_`
function testButton00_(key){
var t = bowl[key];
alert("testButton00_: value = "+t);
}
However, whenever I try to access the array from within code with a key that is just a non-explicit string, I get undefined. Do I have somehow have to pass the parameter with the escaped 'key'?
The key can be a dynamically computed string. Give an example of something you pass that doesn't work.
Given:
var bowl = {}; // empty object
You can say:
bowl["fruit"] = "apple";
Or:
bowl.fruit = "apple"; // NB. `fruit` is not a string variable here
Or even:
var fruit = "fruit";
bowl[fruit] = "apple"; // now it is a string variable! Note the [ ]
Or if you really want to:
bowl["f" + "r" + "u" + "i" + "t"] = "apple";
Those all have the same effect on the bowl
object. And then you can use the corresponding patterns to retrieve values:
var value = bowl["fruit"];
var value = bowl.fruit; // fruit is a hard-coded property name
var value = bowl[fruit]; // fruit must be a variable containing the string "fruit"
var value = bowl["f" + "r" + "u" + "i" + "t"];