The foreach statement in some languages has some defined order, processing each item in the collection from the first to the last. In object-oriented languages, an iterator, even if implicit, is often used as the means of traversal. This avoids potential off-by-one errors and makes code simpler to read. Unlike other for loop constructs, however, foreach loops usually maintain no explicit counter: they essentially say "do this to everything in this set", rather than "do this x times". foreach is usually used in place of a standard for loop statement. PHP provides a way for objects to be defined so it is possible to iterate through a list of items, with, for example a foreach statement. Object.keys() returns an array containing the keys of all properties on any given object.In computer programming, foreach loop (or for-each loop) is a control flow statement for traversing items in a collection. Iterate Over Property Keys With Object.keys()
Let's take a look at some of the modern ways to iterate over an object's properties in JavaScript. In this case, iteration over a data set means to run some code for each item in the set. In simple terms, iteration is the process of repeating certain algorithmic steps until a particular condition is met. We can also iterate over the properties of the object to process them one by one. We can access any property or method from within the object using the this reference.
Inside the subtract method which subtracts the new expense from the bank balance, we accessed the balance property using this. Methods are functions which perform specific tasks within the object. Each object property consists of the property accessor (e.g.
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