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?](https://stackoverflow.com/questions/20798477/how-to-find-index-of-all-occurrences-of-element-in-array) — Alon Eitan, Feb 01 '20 at 14:23
surely its if(array.indexOf(string) == -1) { ... do stuff ... } — gavgrif, Feb 01 '20 at 16:00

score 4 · Accepted Answer · answered Feb 01 '20 at 14:26

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 01 '20 at 14:26

Aaron

1,600
1
8
14

score 1 · Answer 2 · answered Feb 01 '20 at 14:45

1

You can use JavaScript inbuilt functions:

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

answered Feb 01 '20 at 14:45

Sukanta Bala

871
1
9
19

score 0 · Answer 3 · answered Feb 01 '20 at 14:25

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 01 '20 at 14:25

Emech

611
1
4
16

score 0 · Answer 4 · answered Feb 01 '20 at 14:31

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 01 '20 at 14:31

Pasha

621
8
21

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

4 Answers4