Javascript variable object keys [duplicate]

Question

I am attempting to add a variable key, with no luck.

Here's what I got so far:

mysql('translations',{
    check: 'element_id',
    element_id: element_id,
    {'lang-'+lang_id}: value
});

The variable key is the last line of the function.

Any ideas?

Answer 1

You can't use expressions for the identifiers in an object literal.

First create the object, then you can use dynamic names:

var obj = {
  check: 'element_id',
  element_id: element_id,
}

obj['lang-'+lang_id] = value;

mysql('translations', obj);

Answer 2

You can do this:

var x = {
    check: 'element_id',
    element_id: element_id    
};
x['lang-'+lang_id] = value;

mysql('translations', x);