var str = "Hello world, welcome to the universe. W3Schools is optimized for learning, testing, and training. Definition and Usage The indexOf () method returns the position of the first occurrence of a specified value in a string. "; The loop does not offer any syntax to do this, but you can combine the destructuring syntax introduced in ES6 with calling the entries() method on the array: for (const [i, v] of ['a', 'b', 'c']. L'instruction for...of permet de créer une boucle Array qui parcourt un objet itérable (ce qui inclut les objets Array, Map, Set, String, TypedArray, l'objet arguments, etc.) Une propriété qui a été supprimée avant que la boucle n'itère sur celle-là ne sera pas dans la boucle. var str = "Hello world, welcome to the universe. The search will start at the specified position, or at the beginning if no start position is specified, and end the search at the end of the array. This method returns -1 if the value to search for never occurs. The source for this interactive example is stored in a GitHub repository.

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et qui permet d'exécuter une ou plusieurs instructions pour la valeur de chaque propriété. "; If you'd like to contribute to the interactive examples project, please clone You can also iterate over an object that explicitly implements the The following example shows the difference between a This loop is similar to the first one, but it uses Get the latest and greatest from MDN delivered straight to your inbox.The newsletter is offered in English only at the moment. var str = "Hello world, welcome to the universe. Well organized and easy to understand Web building tutorials with lots of examples of how to use HTML, CSS, JavaScript, SQL, PHP, Python, Bootstrap, Java and XML. The compatibility table on this page is generated from structured data. A for-of loop, introduced in ES6, is a great way to iterate over an array: for (const v of ['a', 'b', 'c']) { console.log(v) } How can you get the index of an iteration?

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Sign in to enjoy the benefits of an MDN account. "; Note: The indexOf () method is case sensitive. Une boucle for...in parcourt les propriétés d'un objet dans un ordre arbitraire (voir l'opérateur deletepour plus d'explications quant à l'impossibilité de se fier à un tel ordre, au moins dans le cas où on souhaite gérer plusieurs navigateurs). Definition and Usage The indexOf () method searches the array for the specified item, and returns its position. Examples might be simplified to improve reading and basic understanding. Les propriétés qui ont été … The compatibility table on this page is generated from structured data. Si une propriété est modifiée dans une des itérations de la boucle et que la boucle itère ensuite sur cette propriété, sa valeur sera celle qui a été modifiée. The indexOf() method returns the position of the first occurrence of a specified value in a string.This method returns -1 if the value to search for never occurs.Find the first occurrence of the letter "e" in a string:Find the first occurrence of the letter "e" in a string, starting the search at position 5:If you want to report an error, or if you want to make a suggestion, do not hesitate to send us an e-mail: Returns -1 if the item is not found. If you haven’t already created an account, you will be prompted to do so after signing in. Tutorials, references, and examples are constantly reviewed to avoid errors, but we cannot warrant full correctness of all content.