How do you write a for loop in ES6?

How do you write a for loop in ES6?

The following example shows how to use the for…of to iterate over elements of an array:

1. let scores = [80, 90, 70]; for (let score of scores) { score = score + 5; console.log(score); }
2. 85 95 75.
3. let scores = [80, 90, 70]; for (const score of scores) { console.log(score); }
4. 80 90 70.

How do you comment out multiple lines in JavaScript?

Multiline (Block) Comments

Javascript multiline comments, also known as block comments, start with a forward slash followed by an asterisk (/*) and end with an asterisk followed by a forward slash (*/). They do not require a comment delimiter character on every line and may contain newlines.

How do you comment out JavaScript code?

To create a single line comment in JavaScript, you place two slashes “//” in front of the code or text you wish to have the JavaScript interpreter ignore. When you place these two slashes, all text to the right of them will be ignored, until the next line.

How for in loop works in JavaScript?

for/in – loops through the properties of an object. for/of – loops through the values of an iterable object. 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.

How do you write a for loop?

for loop in C

1. The init step is executed first, and only once. This step allows you to declare and initialize any loop control variables.
2. Next, the condition is evaluated.
3. After the body of the ‘for’ loop executes, the flow of control jumps back up to the increment statement.
4. The condition is now evaluated again.

Is for of loop ES6?

The for-of loop, introduced in the sixth edition of EcmaScript (ES6), allows the programmer to loop over the actual iterable objects. This means that when used in an array, the variable used inside a for-of loop will return the element itself, and not the index.

What is the shortcut to comment multiple lines in JavaScript?

What is the shortcut to comment out in JavaScript? You can comment out a line of code using the Ctrl + / shortcut for single line comment. For multi-line comment select the lines of code and press Ctrl + / .

How do I make a whole block of code comment?

Using #’s to Comment a Block of Code
The most straight-forward way to comment out a block of code in Python is to use the # character. Any Python statement that begins with a hashtag will be treated as a comment by the compiler. There’s no end to how many block comments you can have, in a row or otherwise.

What is === in JavaScript?

The strict equality operator ( === ) checks whether its two operands are equal, returning a Boolean result. Unlike the equality operator, the strict equality operator always considers operands of different types to be different.

Should I comment JavaScript code?

The main purpose of writing comments is to let readers know what they can expect from our code. Thus, they will read the comments and understand what is going on before going through the code. So, it is always good to use comments above the code you explain, and it will save a lot of time for the reader.

Which is syntax of for loop?

Syntax of a For Loop
The initialization statement describes the starting point of the loop, where the loop variable is initialized with a starting value. A loop variable or counter is simply a variable that controls the flow of the loop. The test expression is the condition until when the loop is repeated.

How do you use a for loop?

A “For” Loop is used to repeat a specific block of code a known number of times. For example, if we want to check the grade of every student in the class, we loop from 1 to that number. When the number of times is not known before hand, we use a “While” loop.

What are the 3 types of loops?

The three types of loop control statements are: break statement. continue statement. pass statement.

What are the 3 parts of a for loop?

Similar to a While loop, a For loop consists of three parts: the keyword For that starts the loop, the condition being tested, and the EndFor keyword that terminates the loop.

How do I loop an array in ES6?

Detailed examples are below.

1. Sequential for loop: var myStringArray = [“Hello”,”World”]; var arrayLength = myStringArray. length; for (var i = 0; i < arrayLength; i++) { console.
2. Array.prototype.forEach : The ES5 specification introduced a lot of beneficial array methods.
3. ES6 for-of statement:

What is difference between Forin and for OF in JavaScript?

The main difference between them is in what they iterate over. The for…in statement iterates over the enumerable string properties of an object, while the for…of statement iterates over values that the iterable object defines to be iterated over.

How do you comment multiple lines at once?

Press Ctrl + /

1. Select all the lines that you would like to be commented.
2. Press Ctrl + / Two slashes “//” will be added to the front of each line, causing them to be recognized as a comment.

How do you comment out multiple lines or codes?

Windows: Ctrl + K + U. Mac: Command + K + U.

How do you comment multiple lines in a script?

In Shell or Bash shell, we can comment on multiple lines using << and name of comment. we start a comment block with << and name anything to the block and wherever we want to stop the comment, we will simply type the name of the comment.

How do you comment out multiple lines in code blocks?

Comment multiple lines of code – YouTube

What is == and === in JavaScript?

== in JavaScript is used for comparing two variables, but it ignores the datatype of variable. === is used for comparing two variables, but this operator also checks datatype and compares two values. Checks the equality of two operands without considering their type. Compares equality of two operands with their types.

What means === in JS?

strict equality operator
The strict equality operator ( === ) checks whether its two operands are equal, returning a Boolean result. Unlike the equality operator, the strict equality operator always considers operands of different types to be different.

How does a for loop start?

The initialization statement is executed before the loop begins. The test statement which will test if a given condition is true or not. If the condition is true, then the code given inside the loop will be executed, otherwise the control will come out of the loop.

How many types of loops in JS?

JavaScript now supports five different types of loops: while — loops through a block of code as long as the condition specified evaluates to true. do… while — loops through a block of code once; then the condition is evaluated.

How many types of loops are there in JavaScript?

There are 7 kind of loops you will find in JavaScript.