Introduction to ES7 Features
We have a different version of ES and each version has its own features but in ES7 added new features such as exponentiation operator to as of now JavaScript upheld number-crunching activities like +,- ,*. This administrator raises the principal operand to the power second operand. In other, we can say that it presents the new elements that ECMAScript 2016 (ES7) adds to JavaScript. Since ECMAScript 2015 (otherwise called ES6) was delivered, it has presented an immense arrangement of new elements. They incorporate bolt works, sets, guides, classes and destructuring, and significantly more. So as per requirement, we can utilize the features of ES7.
ES7 Features
Now let’s see different features of ES7 with examples as follows.
Exponentiation Operator
We know that JavaScript already supports the different types of arithmetic operators such as addition, subtraction, and multiplication, etc. ES7 presents another numerical administrator called exponentiation administrator. This administrator is like utilizing Math. pow() technique. Exponentiation administrator is addressed by a twofold indicator **. The administrator can be utilized distinctly with numeric qualities.
Syntax
specified value ** specified exponent value
Explanation
By using the above syntax we can implement an exponentiation operator.
Example
<script>
let b_value = 2
let e_value = 4
console.log('With Math.pow() function' ,Math.pow(b_value, e_value))
console.log('With exponentiation operator ', b_value**e_value)
</script>
Explanation
In the above example, we try to implement the exponentiation operator as shown, here we first need to declare the base value and exponent value as shown. After that, we print the result with Math.pow() function and with function. The final output of the above implementation we illustrated by using the following screenshot as follows.
Array includes
The Array. includes() strategy in ES7 assists with checking to assume a component is accessible in a cluster. Preceding ES7, the indexof() strategy for the Array class could be utilized to confirm on the off chance that a worth exists in a cluster. The indexof() returns the list of the principal event of the component in the exhibit assuming the information is found, else returns – 1 on the off chance that the information doesn’t exist. The Array. includes() strategy acknowledges a boundary, checks assuming the worth passed as boundary exists in the cluster. This technique returns valid assuming that the worth is found, else returns bogus assuming that the worth doesn’t exist.
Syntax
Array.includes(specified value)
Explanation
By using the above syntax we can implement another feature of ES7. We can also provide the index of value with the specified value.
Example
<script>
let stud_marks = [10,20,50,30]
if(stud_marks.includes(20)){
console.log('Element is found in given array')
}else{
console.log(' Element is not found in given array ')
}
if(stud_marks.includes(20,2)){
console.log(‘Element is found in specified array index’)
}else{
console.log(' Element is not found in specified array index ')
}
console.log([NaN].includes(NaN))
let student1 = {stud_name:'Johan'},
student 2 = {stud_name:'Virat'},
student 3={stud_name:'Rohit'}
let students = [student 1, student 2]
console.log(students.includes(student 1))
console.log(students.includes(student 3))
</script>
Explanation
In the above example, we try to implement the array.includes() function. In this example, we implement an array.include() function by using two methods as shown. In the first way, we try to find elements in a given array. Here we check if 20 is present or not in the array. If an element is present in the array then the print message element is found otherwise the element is not found. In a second way, we try to find out the element by using the index of the array as shown. In the second part of the above program, we check not a number in the array. The final output of the above implementation we illustrated by using the following screenshot as follows.
Observation
Have you at any point attempted to blend local DOM occasions, jQuery occasions, occasions from a system like Backbone or Ember, and different occasions from other codes? Furthermore while making occasion overseers in these structures and libraries, have you at any point seen that occasionally your controller fires twice (or more) for the occasions? These befuddles of API plans and the potential for memory spills are two of the biggest issues that JavaScript designers face when managing occasion-based improvement designs. Before, designers must be distinctly mindful of the traps of memory spills, physically eliminating the occasion overseers at the perfect opportunity. As time continued on, system designers kicked savvy and off wiring up the wizardry of unregistering occasion controllers for you. Yet, the issue of befuddled API configuration remains… and can toss some genuine wrenches in the code that should deal with the enrolling and unregistering of occasion overseers.
Enter observables.
While there are new techniques and highlights added to JavaScript to deal with observables locally, the center list of capabilities of a recognizable – the capacity to enroll and unregister an occasion overseer, in addition to other things – is more an API configuration, carried out by you (or another JS dev offering help for them).
Asynchronous function
The conduct behind this grammar is somewhat new, based on top of generators from ES6. Without generators, async capacities are extremely challenging to deal with and require outsider libraries and augmentations for your JavaScript runtime.
Nevertheless, all high-level projects support generators, simplifying it for Babel.js to add async limits, or for you to use the “co” library to make a comparable rundown of abilities without a transpiler. Accepting that you’re running Node.js, v4 and past help generators and v7.9.5+ maintain async works directly.
While the three elements above are accessible and protected to utilize, the topic of when you can utilize new highlights, as they are created, isn’t constantly straightforward.
Before ES7 (formally known as “ES2016”), JavaScript moved at a fairly sluggish speed. It would require a very long time for new dialect highlights to be normalized, executed by programs and other JavaScript runtime conditions, and put into general use by engineers.
It was somewhat simple to know when an element was prepared to use, in the past times, along these lines.
Conclusion
We hope from this article you learn more about the ES7 features. From the above article, we have taken in the essential idea of the ES7 features and we also see the representation and example of the ES7 features. From this article, we learned how and when we use the ES7 features.
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