I have an array of objects.
var array = [obj1, obj2, obj3, objN]
every objects has 3 properties key, name, description.
How can i compare these objects for equality, two objects are equal if they have the same key.
But if a have lets say 4 objects they all must have the same key to be equal.
You can do that using Array.prototype.every():
The
every()method tests whether all elements in the array pass the test implemented by the provided function. (mdn)
Example:
var array = [obj1, obj2, obj3, objN];
var allTheSame = array.every(function(element){
return element.key === array[0].key;
});
Please note that Array.prototype.every() is IE 9+. However, there's a nice polyfill on the mdn page for older versions of IE.
If you really want to use a for loop, you could do it like this:
var array = [obj1, obj2, obj3, objN];
var allTheSame = array.length == 1;
for(var i = 1; i < array.length && (array.length > 1 && allTheSame); i++){
allTheSame = array[0].key == array[i].key;
}
Try it for:
[{key:1},{key:1},{key:1}]; // true
[{key:1},{key:1},{key:2}]; // false
[{key:1},{key:2},{key:1}]; // false
[{key:1}]; // true
var array = [obj1, obj2, obj3, objN];
for(i = 0, i < array.length; i++){
for(j = i + 1; j < array.length; j++){
if(array[i].key == array[j].key){
// Your logic whatever you want to do here.
}
}
}
for loops? o.O