-1

JSON array is var ParamArr = [1,2,3,4]

In the above array I want to check particular number contains in that array

I tried this but not working 

if (!ParamArr.includes(4)) {
  ParamArr.pop(4);
}
Shiladitya
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  • Use `Array.indexOf()` – Terry Oct 26 '17 at 09:40
  • Possible duplicate of [jquery match: how to find whether a keyword exists in an array?](https://stackoverflow.com/questions/6456810/jquery-match-how-to-find-whether-a-keyword-exists-in-an-array) – Se0ng11 Oct 26 '17 at 09:42
  • Please take the time to search for your answer before asking a question. This is one of the most basic operations you can do with an array, which has literally thousands of answers already. – Rory McCrossan Oct 26 '17 at 09:47

7 Answers7

1

You can use the indexOf() function :

var arr = [1,2,3,4];

if(arr.indexOf(4) > -1){
  arr.splice(arr.indexOf(4), 1);
}

console.log(arr);

If you want to remove the element, the function splice() is here for you.

Zenoo
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1

you have it almost correct, but you have a logical issue with your solution. you need to check if array contains the element. so you need to use condition ParamArr.includes(4) and not !ParamArr.includes(4)

var ParamArr = [1,2,3,4];
if (ParamArr.includes(4)) {
  ParamArr.pop(4);
}

console.log(ParamArr);
Dij
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0

Add a simple function like this:

function isInArray(value, array) { return array.indexOf(value) > -1; }

And check with:

isInArray(4, ParamArr);

Tudor-Radu Barbu
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0

jQuery has a utility function for this:

$.inArray(value, array)

Returns index of value in array. Returns -1 if array does not contain value.

Also check How do I check if an array includes an object in JavaScript?

div {
  color: blue;
}

span {
  color: red;
}
<!doctype html>
<html lang="en">

<head>
  <meta charset="utf-8">
  <title>jQuery.inArray demo</title>

  <script src="https://code.jquery.com/jquery-1.10.2.js"></script>
</head>

<body>

  <div>"John" found at <span></span></div>
  <div>4 found at <span></span></div>
  <div>"Karl" not found, so <span></span></div>
  <div>"Pete" is in the array, but not at or after index 2, so <span></span></div>

  <script>
    var arr = [4, "Pete", 8, "John"];
    var $spans = $("span");
    $spans.eq(0).text(jQuery.inArray("John", arr));
    $spans.eq(1).text(jQuery.inArray(4, arr));
    $spans.eq(2).text(jQuery.inArray("Karl", arr));
    $spans.eq(3).text(jQuery.inArray("Pete", arr, 2));
  </script>

</body>

</html>
Sanchit Patiyal
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0

Here you go with a solution

var ParamArr = [1,2,3,4];
if (ParamArr.indexOf(4) >= 0) {
  ParamArr.pop(4);
}

console.log(ParamArr);

Hope this will help you.

Shiladitya
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0

plain old javascript

var tempArray = [1,12,13,14,4];
var elemToBeFound=tempArray[4]; //get the last elem in this ex
 if(tempArray.indexOf(elemToBeFound) > -1){ //means it is present in the array
   var indexOfElem=tempArray.indexOf(elemToBeFound);
   // do what you want to do . you have the index in that array
 }
hannad rehman
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0

var ParamArr=[1,2,3,4];

if( $.inArray(4, ParamArr) !== -1 )

{

    //To do

}

Sandeep Rastogi
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