compare a string with all elements of array in a single loop

Question

I have a string and an array. Let's say there are 5 elements in array now i want to perform a function that if that string is not equal to any value of array then perform function. I simply used a loop to iterate the array for example: I have array

var cars = ["Saab", "Volvo", "BMW","Audi"];
String output ="Audi";
for(let i=0;i<cars.length;i++)
{
   if(output != cars[i])
     {
      // run a code
     }
}

But the problem comes for example the element at index 0 in array is not equal to the string so the condition in loop runs. I want to check whole array in single loop. In simple words, I want to run a function if the value of string does not equal any value of string in javascript

Does this answer your question? How to find index of all occurrences of element in array? — Alon Eitan
– Alon Eitan, Commented Feb 1, 2020 at 14:23
surely its if(array.indexOf(string) == -1) { ... do stuff ... } — gavgrif
– gavgrif, Commented Feb 1, 2020 at 16:00

Aaron · Accepted Answer · 2020-02-01 14:26:41Z

4

Why dont you use the inbuilt function includes? Just check for it in a simple if condition and run your code in it.

var cars = ["Saab", "Volvo", "BMW","Audi"];
let output ="VW";
if(!cars.includes(output)){
  console.log(output);
}

answered Feb 1, 2020 at 14:26

Aaron

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Comments

Sukanta Bala · Accepted Answer · 2020-02-01 14:45:07Z

1

You can use JavaScript inbuilt functions:

var cars = ["Saab", "Volvo", "BMW","Audi"];
if(!cars.includes("Audi")) {
    console.log("OK");
}

answered Feb 1, 2020 at 14:45

Sukanta Bala

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Comments

Emech · Accepted Answer · 2020-02-01 14:25:26Z

0

Check out this please.

var cars = ["Saab", "Volvo", "BMW","Audi"];
var output = "Audi";
var isFound = false;
for(let i=0; i<cars.length; i++) {
   if(output === cars[i]) {
      isFound = true;
      break;
   }
}
if (!isFound) {
   // Do Code
}

answered Feb 1, 2020 at 14:25

Emech

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Comments

Pavlo · Accepted Answer · 2020-02-01 14:31:59Z

0

Something similar to what @Aaron suggested:

const car = 'Saab';
const carInArray = ["Saab", "Volvo", "BMW","Audi"].find(item => item === car);
if(carInArray) { //do work };

answered Feb 1, 2020 at 14:31

Pavlo

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