If array has a specifc value

Question

I've been trying to create an array which will hold a set of numbers. In this case 10, 33, 55 and 99. What I'm looking for is something flexible to search the array for a variable to see if the number is in it.

var nrArray = [10, 33, 55, 99]; // Any number in this array will decide the function below

if ( 55 = nrArray ) {   // If the number 55 is in the array do the following
document.getElementById("demo1").innerHTML = "RUN1";
}
else  {             // If the number 55 does not exist in the array do the following
document.getElementById("demo2").innerHTML = "RUN2";
}

<p id="demo1">demo1</p>
<p id="demo2">demo2</p>

NOTE 55 in this example will be replaced with a variable that has a number set to it. And this number will vary

https://developer.mozilla.org/en/docs/Web/JavaScript/Reference/Global_Objects/Array/indexOf — Abhitalks, Nov 19 '14 at 07:35

uladzimir · Answer 1 · 2015-08-12T10:32:53.867

1

You can use Array.prototype.indexOf. indexOf method will return index of element if it's exist in array or -1 otherwise.

var nrArray = [10, 33, 55, 99];
var myVar = 55;

if (nrArray.indexOf(myVar) !== -1) {
    document.getElementById("demo1").innerHTML = "RUN1";
} else {
    document.getElementById("demo2").innerHTML = "RUN2";
}

<p id="demo1">demo1</p>
<p id="demo2">demo2</p>

edited Aug 12 '15 at 10:32

answered Nov 19 '14 at 07:35

uladzimir

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score 0 · Answer 2 · answered Nov 19 '14 at 07:36

var nrArray = [10, 33, 55, 99]; // Any number in this array will decide the function below

if (nrArray.indexOf(55) > -1 ) {   // If the number 55 is in the array do the following
document.getElementById("demo1").innerHTML = "RUN1";
}
else  {             // If the number 55 does not exist in the array do the following
document.getElementById("demo2").innerHTML = "RUN2";
}

<p id="demo1">demo1</p>
<p id="demo2">demo2</p>

If array has a specifc value

2 Answers2