Iterating through a non-associative array in Java script-CodePudding

I have this non associative array:

var cars = [ 'Lambo', 'Ferrari', 'Jeep' ];

I am trying to iterate throug the items:

for( var key in cars ){
    alert( cars[key] );
}

But it does not work. It's like the key is not being recognized. The for loop works with associative arrays but not with non associative. I am running out of ideas. How can I iterate through a non associative array in Java script?

Please don't flag my questions. Let me know what is wrong and I will fix it as soon as possible.

CodePudding user response：

use of instead of in in the for loop

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/for...of

CodePudding user response：

Generally for...in is not recommended for arrays due to potential issues with unexpected prototype properties appearing in the loop.

For iterating through a non-associative array in JavaScript, you can use various constructs. Here are a few options:

Using forEach()

The forEach() method is available for arrays in JavaScript and is a concise way to iterate through each item in an array.

var cars = ['Lambo', 'Ferrari', 'Jeep'];

cars.forEach(function(car) {
    console.log(car);
});

Using for...of loop

The for...of loop is another clean way to iterate through the elements of an array.

var cars = ['Lambo', 'Ferrari', 'Jeep'];

for (let car of cars) {
    console.log(car);
}

Using a for loop

var cars = ['Lambo', 'Ferrari', 'Jeep'];

for (var i = 0; i < cars.length; i  ) {
    console.log(cars[i]);
}