I have an array like this:
var myObjArray = [{city: 'milwaukee', state: 'wi'},
{city:'madison', state: 'wi'},
{city:'greenbay', state: 'wi'},
{city:'madison', state: 'wi'}];
How would I compare the array against itself to find duplicates.
(Note: I need to keep the duplicates, so maybe I could add a property to the object as a flag).
How about something like:
var bucket = {};
for(var i=0;i<array.length;i++) {
var item = array[i];
var hash = JSON.stringify(item); //or some a hashing algorithm...
var prev = bucket[hash];
if(prev) {
prev.duplicate = item.duplicate = true;
} else {
bucket[hash] = item
}
}
Or same without dependending upon JSON.stringify:
var markDuplicates = function(array, hashFunc) {
var bucket = {};
for(var i=0;i<array.length;i++) {
var item = array[i];
var hash = hashFunc(item);
var prev = bucket[hash];
if(prev) {
prev.duplicate = item.duplicate = true;
} else {
bucket[hash] = item
}
}
return array;
};
markDuplicates(yourArray, function(item) { return item.city + item.state; });
Related
how could i make this function recursive and remove the for in loop here.
where i get the result of Maark, Maary etc by using this function.
function get_suggestion_array_from_object () {
var test_searchstring = 'Ma';
var test_current_object_string = '{"a":{"r":{"k":0,"y":0}, "s":{"s":0,"y":0}}}';
var test_current_object = JSON.parse(test_current_object_string);
var suggestion_array = [];
for (var item in test_current_object) {
var one = item;
for( var item2 in test_current_object[item]) {
var two = item2;
console.log( test_searchstring + one + two );
}
}
}
}
get_suggestion_array_from_object ()
function traverse(path, string = ""){
const result = [];
for(const [key, value] of Object.entries(path)){
if(typeof value === "object"){
result.push(...traverse(value, string + key));
} else {
result.push(string + key);
}
}
return result;
}
So one can do:
const result = traverse({a: { r: {k: 0, y: 0}}}, "M");
I am trying to push elements to an array in a nested loop, but only the last item is getting repeated in the final array, where am I going wrong, very new to javascript asynchronous concept.Below is the function in which I push the items to an array.
$scope.showBeList = function(feed) {
if (feed[srcServ.KEY_CONTENT_TEXT]) {
var content = JSON.parse(feed[srcServ.KEY_CONTENT_TEXT])
if (content) {
$scope.beList = {};
for (var key in content) {
var decorationVal;
//reading value from a lokijs collection
var decoration = dataServ[srcServ.CONST_COLLECTION_DECORATION].find({
'name': key
});
if (decoration && decoration.length) {
decorationVal = decoration[0];
if (decorationVal != null) {
var tempObj = JSON.parse(decorationVal.value);
if (tempObj) {
var header = tempObj[key][key + '_HEADER'];
if (header) {
var counter = content[key].length;
var tempItems = [];
for (var j = 0; j < content[key].length; j++) {
(function(j) {
var obj = {};
obj[srcServ.KEY_MAIN_HEADER] = tempObj[key][srcServ.KEY_DESC];
obj[srcServ.KEY_SUB_HEADER] = header[srcServ.KEY_DESC];
obj.id = j;
var itemVal = content[key][j][key + '_HEADER'];
var details = [];
var notes = [];
for (var item in itemVal) {
var val = null;
var found = false;
for (var i = 0; i < header.field.length; i++) {
if (header.field[i].name == item) {
val = header.field[i];
found = true;
break;
}
}
if (found && val != null) {
val[srcServ.KEY_DESC_VALUE] = itemVal[item];
details.push(val);
}
}
obj.details = details;
counter--;
if (counter == 0) {
$scope.showMoreDetails = true;
$scope.beList.beItems = tempItems;
console.log(JSON.stringify($scope.beList));
}
tempItems.push(obj)
})(j);
// $scope.beList.beItems.push(obj);
}
}
}
}
}
}
}
}
}
I have an array of objects. Every object in the array has an id and an item property that is an array containing other object. I need to be able to find an element in an array by id. Here is a sample of what I have done so far, but the recursive function is always returning undefined.
How can I quit the function and return the item when I have called the function recursively several times?
$(function () {
var treeDataSource = [{
id: 1,
Name: "Test1",
items: [{
id: 2,
Name: "Test2",
items: [{
id: 3,
Name: "Test3"
}]
}]
}];
var getSubMenuItem = function (subMenuItems, id) {
if (subMenuItems && subMenuItems.length > 0) {
for (var i = 0; i < subMenuItems.length; i++) {
var item;
if (subMenuItems[i].Id == id) {
item = subMenuItems[i];
return item;
};
getSubMenuItem(subMenuItems[i].items, id);
};
};
};
var searchedItem = getSubMenuItem(treeDataSource, 3);
alert(searchedItem.id);
});
jsFiddle
You should replace
getSubMenuItem(subMenuItems[i].items, id);
with
var found = getSubMenuItem(subMenuItems[i].items, id);
if (found) return found;
in order to return the element when it is found.
And be careful with the name of the properties, javascript is case sensitive, so you must also replace
if (subMenuItems[i].Id == id) {
with
if (subMenuItems[i].id == id) {
Demonstration
Final (cleaned) code :
var getSubMenuItem = function (subMenuItems, id) {
if (subMenuItems) {
for (var i = 0; i < subMenuItems.length; i++) {
if (subMenuItems[i].id == id) {
return subMenuItems[i];
}
var found = getSubMenuItem(subMenuItems[i].items, id);
if (found) return found;
}
}
};
I know its late but here is a more generic approach
Array.prototype.findRecursive = function(predicate, childrenPropertyName){
if(!childrenPropertyName){
throw "findRecursive requires parameter `childrenPropertyName`";
}
let array = [];
array = this;
let initialFind = array.find(predicate);
let elementsWithChildren = array.filter(x=>x[childrenPropertyName]);
if(initialFind){
return initialFind;
}else if(elementsWithChildren.length){
let childElements = [];
elementsWithChildren.forEach(x=>{
childElements.push(...x[childrenPropertyName]);
});
return childElements.findRecursive(predicate, childrenPropertyName);
}else{
return undefined;
}
}
to use it:
var array = [<lets say an array of students who has their own students>];
var joe = array.findRecursive(x=>x.Name=="Joe", "students");
and if you want filter instead of find
Array.prototype.filterRecursive = function(predicate, childProperty){
let filterResults = [];
let filterAndPushResults = (arrayToFilter)=>{
let elementsWithChildren = arrayToFilter.filter(x=>x[childProperty]);
let filtered = arrayToFilter.filter(predicate);
filterResults.push(...filtered);
if(elementsWithChildren.length){
let childElements = [];
elementsWithChildren.forEach(x=>{
childElements.push(...x[childProperty]);
});
filterAndPushResults(childElements);
}
};
filterAndPushResults(this);
return filterResults;
}
I have a sample code:
function getKeyword() {
var instance = this;
var googlePattern = /(www\.google\..*)/;
this.params = function(parameters) {
var result = [];
var params = parameters.split("&");
for(var p in params) {
var kv = params[p].split("=");
result[kv[0]] = kv[1];
}
return result;
};
this.googleKeywords = function(params){
var query = params["q"];
var pattern = /"(.*?)"|(\w+)/g;
return decodeURIComponent(query).replace(/\+/g, " ").match(pattern);
};
this.parseReferrer = function(){
var result = [];
var pathAndParams = document.referrer.split("?");
if(pathAndParams.length == 2) {
var path = pathAndParams[0];
var params = this.params(pathAndParams[1]);
if(path.search(googlePattern) > 0) {
result = this.googleKeywords(params);
}
}
return result;
};
return this.parseReferrer();
}
And then:
<script type="text/javascript">
if (document.referrer && document.referrer != "") {
if (document.referrer.search(/google\.*/i) != -1){
var keyword = getKeyword();
alert(keyword);
} else {
alert('Not search from google');
}
} else {
alert('Not referrer');
}
</script>
Ex: when i search with keyword is "iphone 5", result not show alert("iphone 5") ? How to fix it ?
The JavaScript for in construct loops over more than just the entries in the array. If you want to use for in you need to make sure that you're only processing the actual parameters. This is easiest accomplished by checking for hasOwnProperty:
this.params = function(parameters) {
var result = [];
var params = parameters.split("&");
for(var p in params) {
if (params.hasOwnProperty(p))
{
var kv = params[p].split("=");
result[kv[0]] = kv[1];
}
}
return result;
};
Alternatively you can use a regular for loop over the array:
this.params = function(parameters) {
var result = [];
var params = parameters.split("&");
for(var i=0; i < params.length; i++) {
var kv = params[i].split("=");
result[kv[0]] = kv[1];
}
return result;
};
I am currently doing this but it isn't working:
var tempArray=new Array();
var number = 15;
tempArray[number]='blabla';
for (var key in tempArray) {
alert(tempArray[key]);
}
the output that I get is:
in_array function (element) { var retur = false; for (var values in this) { if (this[values] == element) { retur = true; break; } } return retur; }
What am I doing wrong?
In JavaScript we use Objects.
var obj = {};
obj["15"] = "blabla";
obj.fifteen = "blablah";
for(var i in obj) {
alert(obj[i]);
}