I need one help.I have an array which contains the json data.I need to check any given key is exist or not in that array using Javascript/Angular.js.I am explaining an array below.
var arr = [{
'category': 1,
'subcategory': 2,
'check': true
}, {
'category': 1,
'subcategory': 2
}];
You can check above for 1 index there is no check key.I need to check that key so that i can fetch check:true or check is not present at all.Please help me.
You can use some() and hasOwnProperty()
some() executes the callback function once for each element present in the array until it finds one where callback returns a truthy value (a value that becomes true when converted to a Boolean). If such an element is found, some() immediately returns true. Otherwise, some() returns false. callback is invoked only for indexes of the array which have assigned values; it is not invoked for indexes which have been deleted or which have never been assigned values. (Taken from here)
var arr = [{
'category': 1,
'subcategory': 2,
'check': true
}, {
'category': 1,
'subcategory': 2
}];
var key='check';
var res = arr.some(function(v) {
return v.hasOwnProperty(key);
});
console.log(res);For older browser check polyfill option of some method.
If you want to get the value or the object which has the property then use find() instead
var arr = [{
'category': 1,
'subcategory': 2,
'check': true
}, {
'category': 1,
'subcategory': 2
}];
var key = 'check';
var res = arr.find(function(v) {
return v.hasOwnProperty(key);
});
console.log(res);For older browser check polyfill option of find method.
Or with simple for loop
var arr = [{
'category': 1,
'subcategory': 2,
'check': true
}, {
'category': 1,
'subcategory': 2
}];
var chk = 0;
for (var i = 0; i < arr.length; i++) {
if (arr[i].check == true) {
chk = 1;
break;
}
}
console.log(chk);
find() can be used , thanks and answer updated :)check==true??As @PranavCBalan said you can use the method hasOwnProperty().
I recommend you to take a look at Lodash. You can find there a lot of utilities that solve the typical checks or functions that you may need in your code.
try this
angular.forEach(arr,function(value,key){
if(value.check == true)
value.check = 1;
else if(value.check == undefined)
value.check = 0;
})
var app = angular
.module('MyApp', [
])
.controller('Main', ['$scope', function ($scope) {
$scope.arr = [
{
'category': 1,
'subcategory': 2,
'check': true
},
{
'category': 1,
'subcategory': 2
}
];
angular.forEach($scope.arr,function(value,key){
if(value.check == true)
value.check = 1;
else if(value.check == undefined)
value.check = 0;
})
}])<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.2.23/angular.min.js"></script>
<div class="main-content" ng-app="MyApp" ng-controller="Main">
<pre>{{arr|json}}</pre>
</div>
object.check ? object.check : '404: not found'