For loop example: 1 2 3 4 5 6 var sum = 0; for (var i=1; i<=100; i++) { sum += i; } alert(sum); //5050 You may use break to jump out of the loop:1 2 3 4 5 6 7 var sum = 0; for (var i=1; i<=100; i++) { if (i == 50) break; stop the loop...
Let's look at an example that shows how to use a for-in loop in JavaScript. For example: vartotn_colors={primary:'blue',secondary:'gray',tertiary:'white'};for(varcolorintotn_colors){console.log(totn_colors[color]);} In this example, the following will be output to theweb browser ...
Removingforloop’s clauses One way to putforloops in good use would be to optimize them, by removing the expressions.Each one of them can be omitted, or you can even omit them all. We will be using the same code of the example above, only we’ll modify it according to the thing w...
for(vari =0; i <10; i++) { // some code } // Here i is 10 Try it Yourself » Usingletin a loop: Example leti =5; for(leti =0; i <10; i++) { // some code } // Here i is 5 Try it Yourself » In the first example, usingvar, the variable declared in the loop...
In the example below, the car object contains various properties. We used the for…in loop to traverse through each key of the object.In the output, we can see that it prints the key and its value. We use the '[]' (member of) operator to access the value of the key from the ...
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...
Theforstatement in JavaScript has the same syntax as in Java and C. It has three parts: Initialization- Initializes the iterator variablei. In this example, we initializeito 0. Condition- As long as the condition is met, the loop continues to execute. In this example, we check thatiis ...
A for in loop will iterate through every property in an object. In your example, the x variable will cycle through every property in the mycars object. If you add mycars.expensive = "Porsche";, it will find that too. Note that, as stated by MDC, for in loops should not be used...
element- items in the iterable In plain English, you can read the above code as: for every element in the iterable, run the body of the loop. for...of with Arrays Thefor..ofloop can be used to iterate over anarray. For example, ...
For loop example over an iterable object In the following example, we’re looping over the variable obj and logging each property and value: const obj = { "a": "JavaScript", 1: "PHP", "b": "Python", 2: "Java" }; for (let key in obj) { console.log(key + ": " + obj[key...