[英]Having trouble creating a new array of objects in angular (loop inside of loop)
我想做的是比較兩個數組“ similarBands”和“ artistsArray”。 我想記下兩個數組中發生的每個匹配(這是我創建計數器的邏輯)。 我要尋找的最終結果是一個新的對象數組(稱為newMatchingArray),這兩個數組的所有匹配項都將具有name屬性和matchs屬性(指示存在多少個匹配項)。
該函數現在可以正確找到匹配項,但不會在每次匹配中都增加“計數器”,而是在2處停止。我對JS和AJAX完全陌生,因此對於明顯的問題/缺少技術細節感到抱歉。 謝謝!
$scope.getBandsLikeThisBand = function(){
$.ajax({
async: false,
type: 'Get',
url: 'https://api.spotify.com/v1/artists/' + $scope.bandId + '/related-artists',
success: function(data){
console.log($scope.allTheArtists);
$scope.similarBandsArray = data.artists;
$scope.similarMathesArray = [];
$scope.newMatchingArray = [];
for(var i = 0; i < $scope.similarBandsArray.length; i ++){ //going through every related artist from the search
var counter = 0;
for (var x = 0; x < $scope.allTheArtists.length; x ++){ //going through every artist in the allTheArtistsArray
if($scope.similarBandsArray[i].name === $scope.allTheArtists[x].name){
counter ++;
if (counter > 0){
var toBeAddedToMutual = {
name: $scope.similarBandsArray[i],
count: counter
};
$scope.newMatchingArray.push(toBeAddedToMutual);
}
}
if($scope.soManyObjects && $scope.soManyObjects.amount > 0 ){
$scope.bigBoyArray.push($scope.soManyObjects.name + "and their count is" + ($scope.soManyObjects.amount + 1));
}
}
}
for(var j = 0; j < $scope.similarBandsArray.length; j ++){
$scope.allTheArtists.push($scope.similarBandsArray[j]);
}
}
});
};
當找到第一個匹配項時, counter
將變為1。然后創建一個toBeAddedToMutual
對象,並將其插入到數組中。 計數如何可以是其他任何值?
您是要從第二個if-block
移出第二個if-block
if-block
嗎?
var counter = 0;
for (var x = 0; x < $scope.allTheArtists.length; x ++){
if ($scope.similarBandsArray[i].name === $scope.allTheArtists[x].name){
counter ++;
}
if (counter > 0) {
var toBeAddedToMutual = {
name: $scope.similarBandsArray[i],
count: counter
};
$scope.newMatchingArray.push(toBeAddedToMutual);
}
....
就像@FernandoPinheiro所建議的那樣,您可以使用lambda表達式來縮短代碼。
angular.forEach($scope.similarBandsArray, function(band) {
var matches = $scope.allTheArtists.filter(function(artist) {
return band.name === artist.name;
});
if (matches.length) {
$scope.newMatchingArray.push({
name: band, // maybe you mean band.name
count: matches.length
});
}
....
});
查看此庫: https : //lodash.com/
它具有算法可能需要的所有功能,例如數組,過濾器之間的差異等。
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