I need to check if an object is logically in an array, when two object are logically equals(Just like the equals in Java), it will be treated as "in" the array
While I use $.inArray of jQuery to test below code, it retuans -1,indicating that the copied one is not treated as "in" the array.
var a =[{value: "G27", title: "G27"}];
$.inArray({value: "G27", title: "G27"},a); //returns -1
Above is just an example ,Is there an easy way for generic cases to achieve that
A workaround would be to check for each key-value pair in a for loop:
function exist(arr, obj){
var len = Object.keys(obj).length;
var count = 0;
for(var i=0;i<arr.length;i++){
count=0;
for(var key in obj){
if(obj[key] == arr[i][key]){
count++;
}
}
if(count == len && count == Object.keys(arr[i]).length){
console.log("Exists!!");
return;
}
}
console.log("Don't exist!!");
}
var arr =[{value: "G27", title: "G27"}];
var b = {value: "G27", title: "G27"};
//Call
exist(arr, b);
If you feel like using underscore.js, you could try using _.findWhere():
var a = [{value: "G27", title: "G27"}];
snippet.log(_.findWhere(a, {value: "G27", title: "G27"}) !== undefined); // returns true<script src="http://tjcrowder.github.io/simple-snippets-console/snippet.js"></script>
<script src="http://underscorejs.org/underscore-min.js"></script>You could use the filter method of the array.
var arr = [{value: "G27", title: "G27"}];
// Don't call filter on arr because this will mutate arr itself. Instead of creating a new array.
var filteredArr = Array.prototype.filter.call(arr, function(item) {
return item.value == "G27" && iem.title == "G27";
});
if(filteredArr.length > 0) {
// Item exists
}
You may try custom search:
var indexOf = function(array, obj) {
var i = array.length;
var o;
while (o = array[--i]) //note, its assignment
if (obj.value === o.value && obj.title === o.title)
break;
return i;
};
var arr = [{
value: "G27",
title: "G27"
}, {
value: "G28",
title: "G28"
}, {
value: "G29",
title: "G29"
}];
console.log(indexOf(arr, {
title: "G28",
value: "G28"
})); //<-- 1
console.log(indexOf(arr, {
title: "G30",
value: "G30"
})); //<-- -1
{ title: "G28", value: "G28" } Or { title: "G28", value: "G28" } is the same than { value: "G28", title: "G28" }
var b = {value: "G27", title: "G27"}; var a =[b]; $.inArray(b,a); //returns 0