Here is my code:
var subMed = [ {med:'bm', sub:[ 'a' , 'b' ]} , {med:'bm', sub:[ 'c' , 'd' , 'e' ]} ];
var sal = [ {num:"1",amount:"500"} ];
var t = {Class:"1", subMeds:subMed, numOfSub:2, sals:sal };
var infoAcademic = [];
infoAcademic.push(t);
subMed = [ {med:'em', sub:[ 'p']} , {med:'bm', sub:[ 'r' , 's' ]} ];
sal = [ {num:"2",amount:"1500"},{num:"1",amount:"700"} ];
t = {Class:"1", subMeds:subMed, numOfSub:1, sals:sal };
infoAcademic.push(t);
var tempObj = infoAcademic[1]; // an object
var mediumSubjects = tempObj["subMeds"]; // an array
console.log(mediumSubjects);
for(i=0;i<mediumSubjects.length;i++){
var temp = {}; // object
temp = mediumSubjects[i];
if(temp["med"] == 'bm'){
tempObj["numOfSub"] = tempObj["numOfSub"] - temp["sub"].length;
var salArr = tempObj["sals"]; // array
var j = salArr.length;
if(salArr.length > 0){
while(j--){
var salObj = salArr[j]; // object
var howManySub = salObj["num"];
if(howManySub > tempObj["numOfSub"]){
salArr.splice(j,1);
}
}
}
console.log("removing from the medSubjects list: ");
console.log(temp);
var removed = mediumSubjects.splice(i, 1);
break;
}
}
console.log("removed element: ");
console.log(removed);
console.log(mediumSubjects);
When I write this code this an online js editor https://js.do/ , the code gives result as per expected. But when I incorporate this code in a onclick function of my JSP page, no element gets removed from the mediumSubjects array. The removed element shows empty.
However, when I comment out this portion:
tempObj["numOfSubj"] = tempObj["numOfSub"] - temp["sub"].length;
var salArr = tempObj["sals"]; // array
var j = salArr.length;
if(salArr.length > 0){
while(j--){
var salObj = salArr[j]; // object
var howManySub = salObj["num"];
if(howManySub > tempObj["numOfSub"]){
salArr.splice(j,1);
}
}
}
the code surprisingly behaves as expected- it removes the element from the mediumSubjects array.
Is there any synchronization issue or something else? Why this sort of unusual behavior?
N.B. I need to remove elements from the array mediumSubjects, so delete won't work here.
Try this variant:
var newMedSub = medSub.filter(function(elem) {
return elem.med !== 'em';
});
It will help you to get a new array without unnessessary object.
All you actually need is to iterate over the outer array and in the body of this loop you need to iterate over the object keys.
for Example:
// removing med key from the array.
medSub.forEach(obj => {
for (let key in obj) {
if (key === 'med' && obj[key] === 'em') {
delete obj[key];
}
}
});
I hope this helps.
Related
hi i am creating a JSON object after executing a loop. the problem is the JSON object have additional keys. i don't want that keys. that keys are generated by me. for arraigning the json according my requirement. this is code i am using for create my JSON object
var bankdata = data;
var updatebankdata = {}
for (var key in bankdata) {
var id = +key.substr(key.length - 1);
if (isNaN(id)) {
updatebankdata[0] = updatebankdata[0] || {};
updatebankdata[0][key] = bankdata[key];
} else {
var uniqid=$("#bankaccount"+id).attr("uniq_id");
updatebankdata[id] = updatebankdata[id] || {};
var field = key.substring(0, key.length - 1);
updatebankdata[id][field] = bankdata[key];
updatebankdata[id]["uniquid"] = uniquid;
}
}
return updatebankdata;
}
my bank data is like
{bankname1: "new", micrcode1: "mkkk", comments1: "commentsfvfdv", bankname2: "bankfgname", micrcode2: "micrfgcode"…}
i want to change it into like this way
[{bankname1: "new", micrcode1: "mkkk", comments1:
"commentsfvfdv"},{bankname2: "bankfgname", micrcode2: "micrfgcode"}]
but still it getting like this .its not good
{"0":{bankname1: "new", micrcode1: "mkkk", comments1:
"commentsfvfdv"},"1":{bankname2: "bankfgname", micrcode2: "micrfgcode"}
what is the mistake in my code?
You need to use an array instead of an object. Like so:
function func(data) {
var bankdata = data;
var updatebankdata = []; // ARRAY instead of Object
for (var key in bankdata) {
var id = +key.substr(key.length - 1);
if (isNaN(id)) {
updatebankdata[0] = updatebankdata[0] || {};
updatebankdata[0][key] = bankdata[key];
} else {
var uniqid=$("#bankaccount"+id).attr("uniq_id");
updatebankdata[id] = updatebankdata[id] || {};
var field = key.substring(0, key.length - 1);
updatebankdata[id][field] = bankdata[key];
updatebankdata[id]["uniquid"] = uniqid; // CHANGED to "uniqid" to match variable declaration above, not the key on the left is still "uniquid"
}
}
return updatebankdata;
}
Then you can get result like:
JSON.stringify(func({name: 'someval', val: 123}));
"[{"name":"someval","val":123}]"
assign
var updatebankdata = [];
then push your object to array like this
updatebankdata.push(yourObject)
I have an element structured like this:
Element ->
[{values: arrayOfObject, key:'name1'}, ... ,{values: arrayOfObjectN, key:'nameN'}]
arrayDiObject -> [Object1, Object2, ... , ObjectN] //N = number of lines in my CSV
Object1 -> {x,y}
I have to take data from a big string:
cityX#substanceX#cityY#substanceY#
I thought to make it this way, but it seems like it pushes always in the same array of objects. If I put oggetto = {values: arrayDateValue, key: key}; inside the d3.csv function, instead if I put outside the function it add me only empty objects.
Here is my code:
var final = new Array();
var oggetto;
var key;
function creaDati() {
var newdate;
var arrayDateValue = new Array();
var selString = aggiungiElemento().split("#");
//selString is an array with selString[0]: city, selString[1]: substance and so on..
var citySelected = "";
var substanceSelected = "";
for (var i = 0; i < selString.length - 1; i++) {
if (i % 2 === 0) {
citySelected = selString[i];
} else if (i % 2 !== 0) {
substanceSelected = selString[i];
key = citySelected + "#" + substanceSelected;
d3.csv("/CSV/" + citySelected + ".csv", function(error, dataset) {
dataset.forEach(function(d) {
arrayDateValue.push({
x: d.newdate,
y: d[substanceSelected]
});
});
});
oggetto = {
values: arrayDateValue,
key: key
};
arrayDateValue = [];
final.push(oggetto);
}
}
}
Any idea ?
First you should make the if statement for the city and then for the key, which you seem to be doing wrong since you want the pair indexes to be the keys and the not pair to be the city, and you are doing the opposite. And then you need to have the d3.csv and push the objects outside of the if statement, otherwise in your case you are just adding elements with citySelected="".
Try something like :
for(var i = 0; i < selString.length -1; i+=2){
cittySelected = selString[i];
substanceSelected = selString[i+1];
key = citySelected + "#" + substanceSelected;
d3.csv("/CSV/"+citySelected+".csv", function(error, dataset){
dataset.forEach(function(d){
arrayDateValue.push({x: d.newdate, y: d[substanceSelected]});
});
});
oggetto = {values: arrayDateValue, key: key};
arrayDateValue = [];
final.push(oggetto);
}
It's is not the best way to do it, but it is clearer that what you are following, i think.
In the if(i % 2 == 0) { citySelected = ... } and else if(i % 2 !== 0) { substanceSelected = ... } citySelected and substanceSelected will never come together.
The values should be in one statement:
if(...) { citySelected = ...; substanceSelected = ...; }
The string can be splitted into pairs
city1#substance1, city2#substance2, ...
with a regex (\w{1,}#\w{1,}#).
Empty the arrayDateValue after the if-statement.
Hint:
var str = "cityX#substanceX#cityY#substanceY#";
function createArr(str) {
var obj = {};
var result = [];
var key = "";
// '', cityX#substanceX, '', cityYsubstanceY
var pairs = str.split(/(\w{1,}#\w{1,}#)/g);
for (var i = 0; i < pairs.length; i++) {
if(i % 2 !== 0) {
key = pairs[i];
// d3 stuff to create values
obj = {
// Values created with d3 placeholder
values: [{x: "x", y: "y"}],
// Pair
key: key
};
result.push(obj);
}
// Here should be values = [];
}
return result;
}
var r = createArr(str);
console.log(r);
May be you can do like this;
var str = "cityX#substanceX#cityY#substanceY",
arr = str.split("#").reduce((p,c,i,a) => i%2 === 0 ? p.concat({city:c, key:a[i+1]}) : p,[]);
console.log(JSON.stringify(arr));
RESOLVED-
The problem is about d3.csv which is a asynchronous function, it add in the array when it finish to run all the other code.
I make an XMLHttpRequest for each csv file and it works.
Hope it helps.
I don't know what must be title for my question, I think it's so complicated. So, I have A array:
["87080207", "87101133", "91140156"]
And B Array:
["97150575", "97150575", "90141063"]
This B array, I put on html select value. Each of them(A and B array) is related. I need to show 87080207,87101133 (A array) when I choose value 97150575 (B array).
I have tried, but it didn't work.This is my code:
var a=[];
var b=[];
var arrayLength = dataComponentValuation.length;
for (var i = 0; i < arrayLength; i++) {
a.push(dataComponentValuation[i].valuated);
b.push(dataComponentValuation[i].valuator);
}
var ajoin = a.join();
var bjoin = b.join();
$('#valuatedEmpCompId_before').val(ajoin);
$('#valuator_before').val(bjoin);
In select, I put a function, this is it:
function emptyValuated() {
var valby = $("#valBy").val(); //chosen value from select
var b_valby = $("#valuator_before").val();
var b_valuated = $("#valuatedEmpCompId_before").val();
if(b_valby != ''){
if(valby != b_valby)
{
$("#valuatedEmpCompId").val('');
}
else{
$("#valuatedEmpCompId").val(b_valuated);
}
}
else{
$("#valuator_before").val(valby);
$("#valuatedEmpCompId").val(b_valuated);
}
}
Help me please...
As suggested, you could use an object as reference to the values of array A.
var arrayA = ["87080207", "87101133", "91140156"],
arrayB = ["97150575", "97150575", "90141063"],
object = Object.create(null);
arrayB.forEach(function (b, i) {
object[b] = object[b] || [];
object[b].push(arrayA[i]);
});
console.log(object);
I guess nowadays the Map object is a perfect solution for these jobs.
var arrayA = ["87080207", "87101133", "91140156"],
arrayB = ["97150575", "97150575", "90141063"],
myMap = arrayB.reduce((p,c,i) => p.has(c) ? p.set(c, p.get(c).concat(arrayA[i]))
: p.set(c,[arrayA[i]])
, new Map());
console.log(myMap.get("97150575"));
console.log(myMap.get("90141063"));
I have two multidimensional array and i want to create a third multidimensional array:
var reports = [
[48.98,153.48],
[12.3,-61.64]
];
var vulc = [
["ciccio",48.98,153.48],
["cicci",12.3,-61.64],
["intruso",59.9,99.9]
];
And i want to create a new multidimensional array
var nuovarray= [];
for (i=0; i<= reports.length; i++) {
var attivi= reports[i];
var attlat= attivi[0];
var attlng= attivi[1];
for (s=0; s<=vulc.length; s++){
var vulca= vulc[s];
var vulcanam= vulca[0];
var vulcalat= vulca[1];
var vulcalng= vulca[2];
if ((vulcalat==attlat) && (vulcalng==attlng){
var stato= "A";
nuovarray.push([vulcanam,vulcalat,vulcalng,stato]);
}
else{
var stato= "N";
nuovaarray.push([vulcanam,vulcalat,vulcalng,stato]);
}
}
}
i would like to have
var nuovarray= [
["ciccio",48.98,153.48,"N"],
["cicci",12.3,-61.64,"N"],
["intruso",59.9,99.9,"A"]
];
But i don't know if this code is good :/
As I said in the comment, in the for loop, use < not <= (array of length N has indexes 0 ... N-1) ... and swap the outer loop with the inner loop, and only push with value 'N' before the end of the outer loop if the inner loop hasn't pushed with value 'A'
var reports = [
[48.98,153.48],
[12.3,-61.64]
];
var vulc = [
["ciccio",48.98,153.48],
["cicci",12.3,-61.64],
["intruso",59.9,99.9]
];
var nuovarray= [];
for(var s = 0; s < vulc.length; s++) {
var vulca = vulc[s];
var stato= "A"; // default, no match
var vulcanam= vulca[0];
var vulcalat= vulca[1];
var vulcalng= vulca[2];
for(var i = 0; i < reports.length; i++) {
var attivi = reports[i];
var attlat= attivi[0];
var attlng= attivi[1];
if ((vulcalat==attlat) && (vulcalng==attlng)) {
stato = "N";
break; // we've found a match, so set stato = N and stop looping
}
}
nuovarray.push([vulcanam,vulcalat,vulcalng,stato]);
}
document.getElementById('result').innerHTML = (nuovarray).toSource();
<div id='result'></div>
I believe the code will not work the way it is written. At least, it will not give you the expected output. You are iterating through the vulc array inside the loop which iterates through reports. And you are pushing to the nuovarray inside the inner loop. So I would expect 6 elements in nuovarray, not the 3 elements you are expecting.
Did you try running it? That's the easiest way to prove incorrectness.
var reports = [
[48.98,153.48],
[12.3,-61.64]
];
var vulc = [
["ciccio",48.98,153.48],
["cicci",12.3,-61.64],
["intruso",59.9,99.9]
];
var nuovarray = [];
vulc.forEach(function(item, indx){
var bN = 'undefined' !== typeof reports[indx];
bN = bN && item[1] == reports[indx][0] && item[2] == reports[indx][1];
item.push(bN ? 'N' : 'A');
nuovarray.push(item);
});
console.log(nuovarray);
The code maps the given vulc to nuovarray and add the wanted flag to it. The flag is selected by a search over reports and if found, an 'N' is applied, otherwise an 'A' is applied.
var reports = [
[48.98, 153.48],
[12.3, -61.64]
],
vulc = [
["ciccio", 48.98, 153.48],
["cicci", 12.3, -61.64],
["intruso", 59.9, 99.9]
],
nuovarray = vulc.map(function (a) {
a.push(reports.some(function (b) {
return a[1] === b[0] && a[2] === b[1];
}) ? 'N' : 'A')
return a;
});
document.getElementById('out').innerHTML = JSON.stringify(nuovarray, null, 4);
<pre id="out"></pre>
The map() method creates a new array with the results of calling a provided function on every element in this array.
Array.prototype.map()
The push() method adds one or more elements to the end of an array and returns the new length of the array.
Array.prototype.push()
The some() method tests whether some element in the array passes the test implemented by the provided function.
Array.prototype.some()
var reports = [
[48.98,153.48],
[12.3,-61.64]
];
var vulc = [
["ciccio",48.98,153.48],
["cicci",12.3,-61.64],
["intruso",59.9,99.9]
];
console.log(vulc.map(function (item, index) {
item.push(reports.some(function (report) {
return report[0] == item[1] && report[1] == item[2];
})?"N":"A");
return item;
}));
If performance matters, you should use something better than O(n^2):
var existingPoints = {};
reports.forEach(function (row) {
existingPoints[row.join()] = true;
});
var nuovarray = vulc.map(function (row) {
var point = row.slice(1, 3).join();
var flag = existingPoints[point] ? 'A' : 'N';
return row.concat([flag]);
});
I need to know if one or more duplicates exist in a list. Is there a way to do this without travelling through the list more than once?
Thanks guys for the suggestions. I ended up using this because it was the simplest to implement:
var names = [];
var namesLen = names.length;
for (i=0; i<namesLen; i++) {
for (x=0; x<namesLen; x++) {
if (names[i] === names[x] && (i !== x)) {alert('dupe')}
}
}
Well the usual way to do that would be to put each item in a hashmap dictionary and you could check if it was already inserted. If your list is of objects they you would have to create your own hash function on the object as you would know what makes each one unique. Check out the answer to this question.
JavaScript Hashmap Equivalent
This method uses an object as a lookup table to keep track of how many and which dups were found. It then returns an object with each dup and the dup count.
function findDups(list) {
var uniques = {}, val;
var dups = {};
for (var i = 0, len = list.length; i < len; i++) {
val = list[i];
if (val in uniques) {
uniques[val]++;
dups[val] = uniques[val];
} else {
uniques[val] = 1;
}
}
return(dups);
}
var data = [1,2,3,4,5,2,3,2,6,8,9,9];
findDups(data); // returns {2: 3, 3: 2, 9: 2}
var data2 = [1,2,3,4,5,6,7,8,9];
findDups(data2); // returns {}
var data3 = [1,1,1,1,1,2,3,4];
findDups(data3); // returns {1: 5}
Since we now have ES6 available with the built-in Map object, here's a version of findDups() that uses the Map object:
function findDups(list) {
const uniques = new Set(); // set of items found
const dups = new Map(); // count of items that have dups
for (let val of list) {
if (uniques.has(val)) {
let cnt = dups.get(val) || 1;
dups.set(val, ++cnt);
} else {
uniques.add(val);
}
}
return dups;
}
var data = [1,2,3,4,5,2,3,2,6,8,9,9];
log(findDups(data)); // returns {2 => 3, 3 => 2, 9 => 2}
var data2 = [1,2,3,4,5,6,7,8,9];
log(findDups(data2)); // returns empty map
var data3 = [1,1,1,1,1,2,3,4];
log(findDups(data3)); // returns {1 => 5}
// display resulting Map object (only used for debugging display in snippet)
function log(map) {
let output = [];
for (let [key, value] of map) {
output.push(key + " => " + value);
}
let div = document.createElement("div");
div.innerHTML = "{" + output.join(", ") + "}";
document.body.appendChild(div);
}
If your strings are in an array (A) you can use A.some-
it will return true and quit as soon as it finds a duplicate,
or return false if it has checked them all without any duplicates.
has_duplicates= A.some(function(itm){
return A.indexOf(itm)===A.lastIndexOf(itm);
});
If your list was just words or phrases, you could put them into an associative array.
var list=new Array("foo", "bar", "foobar", "foo", "bar");
var newlist= new Array();
for(i in list){
if(newlist[list[i]])
newlist[list[i]]++;
else
newlist[list[i]]=1;
}
Your final array should look like this:
"foo"=>2, "bar"=>2, "foobar"=>1