while- loops through a block of code while a specified condition is true do/while- also loops through a block of code while a specified condition is true The For Loop Theforstatement creates a loop with 3 optio
For example, the same code above could be expressed as follows: JavaScript var i; for (i = 0; i <= 4; i++) { console.log(i); } Here, i is declared in line 1 separately. Inside the for loop's header in line 2, it's only assigned the value 0 to begin with. Now while th...
What's the Best Way to Write a JavaScript For Loop?— some advanced loop best practices
In JavaScript, the for loop is used for iterating over a block of code a certain number of times, or to iterate over the elements of an array. Here's a quick example of the for loop. You can read the rest of the tutorial for more details. Example for (let i = 0; i < 3; i...
For Loop The for statement is a type of loop that will use up to three optional expressions to implement the repeated execution of a code block.Let’s take a look at an example of what that means.for (initialization; condition; final expression) { // code to be executed } Copy...
For Loop石头剪刀游戏是一个使用JavaScript编写的简单游戏。在游戏中,玩家和计算机进行石头、剪刀、布的比拼,通过使用for循环来实现游戏的多轮进行。 在游戏开始时,玩家可以选择石头、剪...
JavaScript for...of loop The syntax of thefor...ofloop is: for(elementofiterable) {// body of for...of} Here, iterable- an iterable object (array, set, strings, etc). element- items in the iterable In plain English, you can read the above code as: for every element in the iter...
for (var i = 0; i < items.length; i++, j++) { // loop code here that operates onitems[i]// and sometimes uses j to access adifferent array } 在上述例子中，i++、j++可以放在允许一个表达式置入的地方。在这种特殊的情况下，多个表达式的使用会产生副作用，因此复合表达式接不接受最后一个...
// code block to be executed } while(condition); Example The example below uses ado whileloop. The loop will always be executed at least once, even if the condition is false, because the code block is executed before the condition is tested: ...
// sub-optimal loop for(vari = 0; i < myarray.length; i++) { // do something with myarray[i] } 这种写法的问题是,每循环一次,都需要从myarray对象中读取length属性,这对于JavaScript来说,可能会导致较大的性能问题。如果myarray是一些大型的对象,或是DOM对象更犹是如此,因为DOM对象的这些方法都是...