Overview
Backport allows you get a list of the names of all JS API features, including those added by backport scripts.Availability
Backport.js v0.1 and above
Syntax
var returnValue = backport();
Parameters
Do not specify any parameters.
Return values
| Value | Type | Description | Backport version |
|---|---|---|---|
| <array> | Array of Strings | An array containing the names of all JS API features that are present. | 0.1 |
Example
// console the status of each feature
backport().forEach(function(feature) {
switch (backport(feature)) {
case -1: { // added
console(feature+" was missing but has been added by a backport script");
break;
}
case 1: { // upgraded/extended
console(feature+" was present but has been upgraded/extended by a backport script");
break;
}
case undefined: { // missing
// note: this will never happen as backport() doesn't list missing features
console(feature+" is missing");
break;
}
case null: { // deprecated
console(feature+" was present but has been removed by a backport script because it's deprecated");
break;
}
case true: { // native
console(feature+" is present and has *not* been altered by backport scripts");
break;
}
}
});
See also
- Check status of an API feature – check status of a specific backport feature (including examples of type coercion which you should be aware of before using!)