Thefor...ofloop was introduced in the later versions ofJavaScript ES6. Thefor..ofloop in JavaScript allows you to iterate over iterable objects (arrays, sets, maps, strings etc). JavaScript for...of loop The syntax of thefor...ofloop is: for(elementofiterable) {// body of for...of...
for (let i = 0; i < 3; i++) { console.log("Hello, world!"); } // Output: // Hello, world! // Hello, world! // Hello, world! Run Code In this example, we used the for loop to print "Hello, world!" three times to the console. JavaScript for loop Syntax The syntax ...
let i = 5; for (let i = 0; i < 10; i++) { // some code} // Here i is 5 Try it Yourself » In the first example, using var, the variable declared in the loop redeclares the variable outside the loop. In the second example, using let, the variable declared in the lo...
The JavaScript for...in Tutorial Syntax for(xinobject) { code block to be executed } Parameters ParameterDescription xRequired. A variable to iterate over the properties. objectRequired. The object to be iterated JavaScript Loop Statements
Syntax You will definitely have to know the syntax offorloops and that goes like this: 1for([initialization]; [condition]; [final-expression]) statement You’ll see in the examples how each of these clauses is translated into code. So let’s start right away. ...
for each in一个类似的但是迭代的是对象的属性的值而不是其属性名字的语句 (过时的) for 迭代器和构造器 (uses thefor...insyntax) Enumerability and ownership of properties Object.getOwnPropertyNames() Object.prototype.hasOwnProperty() Array.prototype.forEach() ...
Note that thevarstatement can also appear as part of theforandfor/inloops (introduced inChapter 6), allowing you to succinctly declare the loop variable as part of the loop syntax itself. For example: for(var i = 0; i < 10; i++) document.write(i, ">br<"); for(var i = 0, ...
I don't see any solution besides a very cumbersome Object.getPrototypeOf loop and remembering which properties were already visited to avoid revisiting "overridden" properties. The problem with the no-restricted-syntax rule is that to re-enable the for ... in restricted syntax locally, you have...
function walkTree(node) { if (node === null) { return; } // 对节点做些什么 for (let i = 0; i < node.childNodes.length; i++) { walkTree(node.childNodes[i]); } } 跟loop 函数相比,这里每个递归调用都产生了更多的递归调用。将...
while(n > 1) { // Repeat statements in {} while expr in () is true product *= n; // Shortcut for product = product * n; n--; // Shortcut for n = n - 1 } // End of loop return product; // Return the product