The good thing with generators is that they are lazy and can take another generator's result as an argument. )Ĭonsole.log('iterate values and indexes from a generator')įor (const of eachWithIndex(eachFromTo(10, 13))) console.log(val, i)Ĭonst anArray = eachToArray(eachFromTo(10, 13))Ĭonsole.log('iterate values and indexes from an array')įor (const of eachWithIndex(anArray)) console.log(val, i) yields every value and index of an iterable (array, generator. The JavaScript for loopiterates the elements for the fixed number of times. It takes three expressions a variable declaration, an expression to be evaluated before each iteration, and an expression to be evaluated at the end of each iteration. convers an iterable to an array (potential infinite loop)įor (const val of iterable) result.push(val) for loop The most basic type of iteration method in JavaScript is the for loop. Or ES6’s, which now has support across current browser versions: for (const of myArray.entries()) For them, there’s ES5’s forEach method that passes both the value and the index to the function you give it: var myArray = You shouldn’t use it to iterate over arrays. Then you can iterate through the generators using the for.of loop.For…in iterates over property names, not values, and does so in an unspecified order (yes, even after ES6). Since generators are iterables, you can implement an iterator in an easier way. You can create an iterator manually and use the for.of loop to iterate through the iterators. You can iterate through Map elements using the for.of loop. It is used to loop through the items in an array, object. Use it to loop over iterable objects (Arrays. The JavaScript for of loop is a control flow statement used to iterate over a sequence of values. You can iterate through Set elements using the for.of loop. for-of is a new loop in ES6 that replaces both for-in and forEach() and supports the new iteration protocol. You can use for.of loop to iterate over string values. In the above program, the for.of loop is used to iterate over the students array object and display all its values.
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