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Comparing keyword value field in array - Javascript [closed]

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I have keyword (for example -2330) that needs to be compared with the 'values' in this string below.
"[{\"type\":\"A_PRODUCT\",\"value\":[[{\"key\":\"SUBCLASS\",\"value\":\"1574\"}],[{\"key\":\"SUBCLASS\",\"value\":\"2331\"}]]}]";
Expected output needs to be true or false depending if the string has the keyword or not.
How do I check it?

I will do something like this to loop
var a = "[{\"type\":\"A_PRODUCT\",\"value\":[[{\"key\":\"SUBCLASS\",\"value\":\"1574\"}],[{\"key\":\"SUBCLASS\",\"value\":\"2331\"}]]}]";
var new_a = JSON.parse(a);
var value_compare = '1574';
new_a[0]['value'].forEach(element => {
if (element[0].value == value_compare) {
//DO SOMETHING
alert('found: '+ JSON.stringify(element));
}
});

You first need to parse the JSON into an suitable JS structure. Because of the nested nature of the data you need to 1) map over the first object in your array, 2) return the value of the value property of the first object of each and finally 3) check to see if the keyword is included in the the returned array, and return true or false.
const json = '[{\"type\":\"A_PRODUCT\",\"value\":[[{\"key\":\"SUBCLASS\",\"value\":\"1574\"}],[{\"key\":\"SUBCLASS\",\"value\":\"2331\"}]]}]';
const data = JSON.parse(json);
function doesItExist(data, keyword) {
const values = data[0].value.map(arr => arr[0].value);
return values.includes(keyword);
}
console.log(doesItExist(data, '2331'));
console.log(doesItExist(data, 'Bob'));
console.log(doesItExist(data, '1574'));

How to check if a number is NOT a property in a javascript object [closed]

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I wanna check if a number is not a property in an object and if is not add it to the object as a property.
var obj{}
var arr=[1,2,3,4]
I´ve tried if(! number in object ) and if(! object.hasOwnProperty(number)) but didn´t work, and in both cases, I also tried to make the number become a string doing number.toString(), and nothing happened.
ar.forEach(number=>{
if(!(number in obj)){ //or number.toString()
})
ar.forEach(number=>{
if(! obj.hasOwnProperty(number)){ //or number.toString()
})

Your code actually works once you fix the typos:
var obj = {3: 'hey'}
var arr = [1, 2, 3, 4]
arr.forEach(number => {
if (!(number in obj)) {
console.log(number + ' is not in obj')
}
}
)

Object.values(your_object) gives you an array with all the values in your object.
Then iterate trough that array and check if it contains your number.

.shift() apparently no longer exists [closed]

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https://jsfiddle.net/a/2L4t9saq/217/ is my fiddle
most of the code you can ignore, here is the function:
var modGrid = function(code){
var arr = code
console.log(arr)
for(var n=1;n<gridx+1;n++){
for(var i = 1; i<gridy+1; i++){
var garbledMess = "[x="+i+"][y="+n+"]"
var idea = arr[0]
arr.shift()
$(garbledMess).css("background-color",idea)
}
}
}
the syntax error is as follows:
Uncaught TypeError: arr.shift is not a function
at modGrid ((index):44)
at window.onload ((index):81)
since the modGrid function takes in an array (in the case of my code an array of 4 elements) the .shift() function should be removing the first option in the array, it worked before i added some more code, but now it is apparently not a function
many thanks

since the modGrid function takes in an array
It is designed to take an array, but that isn't what you are passing it.
You are passing it a string, another string, a number and another number.
modGrid('rgba(255,0,0,1)','rgba(0,255,0,1)',2,1);

compare two big strings with javascript [closed]

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I have two big strings A and B which store a HTML page. I want to compare those variables to see if pages are exactly same, Like if(A === B) alert("same"); else alert ("different");
but it fail to do such comparation , I suppose it is that because of very long string. How to compare in javascript such long strings ?

You can try to use MD5 hashes of long strings.
MD5 (Message-Digest algorithm 5) is a widely-used cryptographic hash
function with a 128-bit hash value. MD5 has been employed in a wide
variety of security applications, and is also commonly used to check
the integrity of data. The generated hash is also non-reversable. Data
cannot be retrieved from the message digest, the digest uniquely
identifies the data.

Try something like this :
var a = 'abasdfasfasd23141234123412';
var b = 'abasdfasfasd23141234XXXXXX';
function compare(a,b) {
var a_arr = a.split();
var b_arr = b.split();
if(a_arr.length != b_arr.length) {
return false;
} else {
for(var i = 0 ; i < a_arr.length ; i++) {
if(a_arr[i] != b_arr[i]) return false;
}
}
return true;
}

Converting string to array object using javascript [closed]

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How can I convert the following string using JavaScript to array:
from: var x = "{id:'2'},{name:'code,Barer'}";
to: var x1 = [{id:"2"},{name:"code,Barer"}];

If you want that exact string to be an array object you can do this:
var x = "{id:'2'},{name:'code,Barer'}";
var newArray = eval("[" + x + "]");
Here are some the dangers of eval: Why is using the JavaScript eval function a bad idea?
How are you getting the variable x? If you can get whatever it is to spit out valid JSON (using JSON.stringify or something similar) you can then parse it correctly into JS (although some implementations of JSON parsers do use eval).

If you want to avoid using eval for security reasons try this
var string = "{id:'2'},{name:'code,Barer'}",
array = string.substr(1, string.length - 2)
.split("},{")
.map(function(item){
item = item.split(":");
var result = {},
name = item[0],
value = item[1].replace(/'/g, "");
result[name] = value;
return result
});