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How can I delete array elements just once to add new ones with a for loop

What I am trying to do is:
set an array value (list) to another array (options).
If the user's input (searchVal) matches with a list value it will delete options, push this match, and then will keep pushing the next matches without deleting options again.
So according to the code below, if searchVal was "whatever", options should return: ["whatever", "whatevEver1"] but, instead, it returns: ["whatever", "WhatEver1", "whatttever", "whatever", "whatevEver1"]
Relevant code:
var list = ["whatever", "WhatEver1", "whatttever"];
var clear = 0;
var options = [];
for (var i=0 ; i < list.length ; i++)
{
options.push([list[i]]);
}
var searchVal = window.prompt(" ");
for (var i=0 ; i < list.length ; i++)
{
if (list[i].toLowerCase().includes(searchVal.toLowerCase())) {
if (clear == 0) {
options.length = 0;
}
options.push([list[i]]);
}
clear++;
}
return options;

Js arrays are pass-by-reference. In order to make independent copy of array you need to use:
let options = JSON.parse(JSON.stringify(list));
I didnt try to implement this to your problem cause im too lazy but i think it might work.

Remove duplicates in array separated by double commas in JavaScript

I have an array in JavaScript like this
var data = [,A_1_VII,VII,V2,,A_1_VII,VII,V2,,A_1_VII,VII,V2,,B_1_XIV,XIV,V3,,B_2_XVI,XVI,V3]
when I alert in JavaScript it gives as below
,A_1_VII,VII,V2
,A_1_VII,VII,V2
,A_1_VII,VII,V2
,B_1_XIV,XIV,V3
,B_2_XVI,XVI,V3
But I want like this which is duplicates removed array
var unique_data = [,A_1_VII,VII,V2,,B_1_XIV,XIV,V3,,B_2_XVI,XVI,V3]
On alert it should give like this
,A_1_VII,VII,V2
,B_1_XIV,XIV,V3
,B_2_XVI,XVI,V3

First Thing your array contains string as a constant that's not going to work.
Secondly, if all of you value are strings you can do it as follows:
var data =[,"A_1_VII","VII","V2",,"A_1_VII","VII","V2",,"A_1_VII","VII","V2",,"B_1_XIV","XIV","V3",,"B_2_XVI","XVI","V3"];
var uniqueArray = data.filter(function(item, pos) {
return data.indexOf(item) == pos;
})
alert(uniqueArray);

Assuming the variables in your array are well defined, you can clean it up and remove duplicates with a for loop:
var data [/* ... */];
var unique_data = [];
for(let i = 0; i < data.length; i++) {
if (data[i] && unique_data.indexOf(data[i]) === -1) {
unique_data.push(data[i]);
}
}
Please note that the code above assumes that your array contains non-object types, otherwise the solution would need to use something more sophisticated than indexOf().

You can create your unique function to remove duplicate entry and empty value from array like this.
var data =[,"A_1_VII,VII","V2,,A_1_VII","VII","V2",,"A_1_VII","VII","V2",,"B_1_XIV,XIV","V3",,"B_2_XVI,XVI,V3"]
var unique_data = uniqueList(data);
alert(unique_data);
function uniqueList(list) {
var uniqueResult = [];
$.each(list, function(i, e) {
if ($.inArray(e, uniqueResult) == -1 &&$.inArray(e, uniqueResult)!="")// chech for unique value and empty value
uniqueResult.push(e);
});
return uniqueResult ;
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>

Getting value from json/javascript array of name/value pairs?

I have a JSON array of name/value pairs and I'm looking at a sensible way to be able to adjust the value for a particular name in the array. e.g.
var myArr = [{"name":"start","value":1},{"name":"end","value":15},{"name":"counter","value":"6"},{"name":"user","value":"Bert"}]
I can use
$.each(myArr, function (key, pair) {
if (pair.name == 'user')
{
pair.value = 'bob';
}
});
but in reality my object has tens of values and I would like to be able to change them much more simply than adding an if for each one.
Ideally myArr['user'].value = 'bob'; or something similar.

You have an array of objects in an array. An array does not have any indexing method that gives you direct lookup like you asked for;
myArr['user'].value = 'bob';
To get that, you would need to restructure your data so that you had an object where the name was the main key and inside that key was another object with the rest of your data for that user like this:
var myData = {
"start": {value: 1},
"end": {value: 15},
"user": {value: Bert}
};
The, you could directly access by name as in:
myData['user'].value = 'bob;
If you wanted to stick with your existing data structure, then the simplest thing I can think of is to make a simple function that finds the right object:
function findUser(data, nameToFind) {
var item;
for (var i = 0; i < myArr.length; i++) {
item = nameToFind[i];
if (item.name === nameToFind) {
return item;
}
}
}
var myArr = [{"name":"start","value":1},{"name":"end","value":15},{"name":"counter","value":"6"},{"name":"user","value":"Bert"}]
Then, you could do something like this:
findUser(myArr, "user").value = "bob";
This assumes you're only looking for data that is in the array because otherwise, this will create an error unless you add error checking to it.
If you just really want to turn the whole thing into a function that finds and changes the name, it can be like this:
function changeUser(data, nameToFind, newName) {
var item;
for (var i = 0; i < myArr.length; i++) {
item = nameToFind[i];
if (item.name === nameToFind) {
item.name = newName;
return;
}
}
}

I will award the points for the best answer, but I actually solved it a completely different way:
First build up a list of "names" in the order they appear:
var keys = [];
$.each(myArr, function (key, pair) {
keys.push(pair.name);
});
then I can use:
myArr[keys.indexOf('sEcho')].value = 'whatever';

Try This
$.grep(myArr,function(e){return e.name=="user"})[0].value="ppp"
You can use the $.greb() of jquery.

Add this function:
function SetArrayValue(arr, key, value, stopOnFirstMatch) {
for (var i=0; i<arr.length; i++) {
if (arr[i].name === key) {
arr[i].value = value
if (stopOnFirstMatch !== undefined && stopOnFirstMatch) return
}
}
}
Then use it this way:
SetArrayValue(myArr, 'user', 'bob')

Find specific key value in array of objects

This is the code:
var groups = {
"JSON":{
"ARRAY":[
{"id":"fq432v45","name":"Don't use me."},
{"id":"qb45657s","name":"Use me."}
]
}
}
I want to get the name value where the id is "qb45657s" how could this be accomplished? I figured the obvious loop through all of the array and check if it's equal but is there an easier way?
Edit: I cannot change "Array" to an object because I need to know the length of it for a different function.

You can simply filter on the given id:
groups["JSON"]["ARRAY"].filter(function(v){ return v["id"] == "qb45657s"; });
This will return [{"id":"qb45657s","name":"Use me."}]

Assuming you had a valid JSON string like this (note I say valid, because you need an enclosing {} or [] to make it valid):
var json = '{"JSON":{
"ARRAY":[
{"id":"fq432v45","name":"Don't use me."},
{"id":"qb45657s","name":"Use me."}
]
}
}';
You would just parse it into an actual object like this:
var jsonObj = JSON.parse(json); // makes string in actual object you can work with
var jsonArray = jsonObj.JSON.ARRAY; // gets array you are interested in
And then search for it like:
var needle = 'qb45657s';
var needleName;
for (var i = 0; i < jsonArray.length; i++) {
if (jsonArray[i].id === needle) {
needleName = jsonArray[i].name;
}
}

Write out name and value from dictionary

This is trivial I know but I'm so used to OOP languages. I'm trying to figure out how to write out each name/value in either one alert or many, just so I can verify the data
var dCookieNameValuePairs = {};
for (i = 0; i < cookieValues.length; i++)
{
var akeyValuePair = aCookieValues[i].split("=");
dCookieNameValuePairs[keyValuePair[0]] = keyValuePair[1];
}
// display each name value pair testing
for (i = 0; i < dCookieNameValuePairs.length; i++)
{
alert("Name: " + dCookieNameValuePairs[] + "Value: " +
}
I'm stuck at the second for loop...I am not sure how to iterate through the dictionary and then focus on each name/value to spit it back.

You want to use for..in for enumerating through a dictionary/map.
for ( var prop in dCookieNameValuePairs ) {
if ( dCookieNameValuePairs.hasOwnProperty( prop ) ) {
alert( dCookieNameValuePairs[prop] )
}
}
I may have typo'd. Only use .length when you are dealing with an array [] or a custom array-like object that you defined to have .length populated.

for (i in dCookieNameValuePairs) {
alert("Name: " + i + " Value: " + dCookieValuePairs[i]);
}
See the "JavaScript Does Not Support Associative Arrays" section of this page for more details.
If you don't need an associative array, you might put the keys and values into an array of objects instead. So your first loop would look something like this:
for (i = 0; i < cookieValues.length; i++) {
var akeyValuePair = cookieValues[i].split("=");
dCookieNameValuePairs.push({key: akeyValuePair[0], value: akeyValuePair[1]});
}