I'm using Protractor and cucumber framework; how do I break out of a .filter or .map loop? I do not want to continue to iterate further if I found a match!
Page.prototype.getElementByKey = function (key) {
var foundElement = null;
return someElement.all(by.css('.someClass')).map(function (rawItem, index) {
var itemObject = new ItemObjectClass(rawItem);
return itemObject.getItemKey().then(function (foundItemKey) {
var matched = String(foundItemKey).trim() === String(key).trim();
console.log(' Matched: { ' + matched + ' } index {'+index+'}');
//if we have a match break out of the .filter function
if (matched) {
foundElement = itemObject;
throw new Error("Just our way of breaking out of .filter() above");
}
});
}).then(function () {
//callback
throw new Error('\n!!!!!Callback should not be called;
this means that we could not find an element that matched the passed in key above');
}, function (error) {
//error
console.log('\n*******************errorCallback was called; '+error);
return foundElement;
});
};
The above code finds the element but continues to iterate until the end instead of stopping when there's a match and breaking out by calling the errorCallback function.
Given that .map function returns "a promise that resolves to an array of values returned by the map function" http://www.protractortest.org/#/api?view=ElementArrayFinder.prototype.map, I'm taking advantage of the fact that a promise will call its errCallback if the promise cannot be resolved.
By throwing an a fake error, the errorCallback should be called and thereby break out of the .map loop.
Unfortunately, it successfully throws the error but continues with the loop instead of breaking out. I know that because when I
console.log("boolean "+matched+" and index "+index);
I get this:
matched: false index: 0
matched: false index: 1
matched: true index 2 //it should have stopped here since matched = true
matched false index 3 // this should NOT have printed
so breaking out isn't working any ideas?