Camron  Shields

Camron Shields

1569557280

JavaScript Array - Check If Every Element Passes a Test: every()

In this tutorial, you will learn how to check whether all the array elements pass a test using the JavaScript Array every() method.

Checking array elements using the for loop

Sometimes, you need to test whether every element of an array satisfies a specified condition.

Typically, you use a for loop to iterate all elements and check each individual element against the condition. Suppose that you have an array numbers with three elements:

let numbers = [1, 3, 5];

The following code checks if every element in the numbers array is greater than zero:

let numbers = [1, 3, 5];
let result = true;
for (let i = 0; i < numbers.length; i++) {
    if (numbers[i] <= 0) {
        result = false;
        break;
    }
}
console.log(result);

Output:

true

How it works:

  • First, initialize the result variable to true.
  • Second, iterate over the elements of the numbers array and check whether each element is less than or equal zero. If it is the case, set the result variable to false and terminate the loop immediately using the break statement. In case no element is less than or equal zero, the value of the result variable remains true.

This code is simple and straight forward. However, it is quite verbose.

JavaScript Array type provides the every() method that allows you to check if every element of an array pass a test in a shorter and cleaner way.

Introduction to JavaScript Array every() method

Starting from ES5, JavaScript Array type provides a method every() that tests every element in an array.

The following example uses the every() to check if every element of the numbers array is greater than zero:

let numbers = [1, 3, 5];
let result = numbers.every(function (e) {
    return e > 0;
});

console.log(result);

Output:

true

By using the ES6 arrow functions, the code can be even shorter:

let numbers = [1, 3, 5];

let result = numbers.every( e  => e > 0);

console.log(result);

It is also much cleaner, isn’t it?

The following illustrates the syntax of the every() method.

arrayObject.every(callback[, thisArg])

The every() method accepts two named arguments: callback and thisArg.

#javascript #programming #developer #web-development

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JavaScript Array - Check If Every Element Passes a Test: every()
Lowa Alice

Lowa Alice

1624388400

JavaScript Arrays Tutorial. DO NOT MISS!!!

Learn JavaScript Arrays

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The origin of the article: https://www.youtube.com/watch?v=oigfaZ5ApsM&list=PLTjRvDozrdlxEIuOBZkMAK5uiqp8rHUax&index=4
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Thanks for visiting and watching! Please don’t forget to leave a like, comment and share!

#arrays #javascript #javascript arrays #javascript arrays tutorial

Terry  Tremblay

Terry Tremblay

1602154740

Fill and Filter in Array in JavaScript

By the word Array methods, I mean the inbuilt array functions, which might be helpful for us in so many ways. So why not just explore and make use of them, to boost our productivity.

Let’s see them together one by one with some amazing examples.

Array.fill():

The _fill()_ method changes all elements in an array to a static value, from a start index (default _0_) to an end index (default _array.length_). It returns the modified array.

In simple words, it’s gonna fill the elements of the array with whatever sets of params, you pass in it. Mostly we pass three params, each param stands with some meaning. The first param value: what value you want to fill, second value: start range of index(inclusive), and third value: end range of index(exclusive). Imagine you are going to apply this method on some date, so that how its gonna look like eg: array.fill(‘Some date’, start date, end date).

NOTE: Start range is inclusive and end range is exclusive.

Let’s understand this in the below example-

//declare array
var testArray = [2,4,6,8,10,12,14];

console.log(testArray.fill("A"));

When you run this code, you gonna see all the elements of testArray will be replaced by 'A' like [“A”,"A","A","A","A","A","A"].

#javascript-tips #array-methods #javascript-development #javascript #arrays

Tamia  Walter

Tamia Walter

1596754901

Testing Microservices Applications

The shift towards microservices and modular applications makes testing more important and more challenging at the same time. You have to make sure that the microservices running in containers perform well and as intended, but you can no longer rely on conventional testing strategies to get the job done.

This is where new testing approaches are needed. Testing your microservices applications require the right approach, a suitable set of tools, and immense attention to details. This article will guide you through the process of testing your microservices and talk about the challenges you will have to overcome along the way. Let’s get started, shall we?

A Brave New World

Traditionally, testing a monolith application meant configuring a test environment and setting up all of the application components in a way that matched the production environment. It took time to set up the testing environment, and there were a lot of complexities around the process.

Testing also requires the application to run in full. It is not possible to test monolith apps on a per-component basis, mainly because there is usually a base code that ties everything together, and the app is designed to run as a complete app to work properly.

Microservices running in containers offer one particular advantage: universal compatibility. You don’t have to match the testing environment with the deployment architecture exactly, and you can get away with testing individual components rather than the full app in some situations.

Of course, you will have to embrace the new cloud-native approach across the pipeline. Rather than creating critical dependencies between microservices, you need to treat each one as a semi-independent module.

The only monolith or centralized portion of the application is the database, but this too is an easy challenge to overcome. As long as you have a persistent database running on your test environment, you can perform tests at any time.

Keep in mind that there are additional things to focus on when testing microservices.

  • Microservices rely on network communications to talk to each other, so network reliability and requirements must be part of the testing.
  • Automation and infrastructure elements are now added as codes, and you have to make sure that they also run properly when microservices are pushed through the pipeline
  • While containerization is universal, you still have to pay attention to specific dependencies and create a testing strategy that allows for those dependencies to be included

Test containers are the method of choice for many developers. Unlike monolith apps, which lets you use stubs and mocks for testing, microservices need to be tested in test containers. Many CI/CD pipelines actually integrate production microservices as part of the testing process.

Contract Testing as an Approach

As mentioned before, there are many ways to test microservices effectively, but the one approach that developers now use reliably is contract testing. Loosely coupled microservices can be tested in an effective and efficient way using contract testing, mainly because this testing approach focuses on contracts; in other words, it focuses on how components or microservices communicate with each other.

Syntax and semantics construct how components communicate with each other. By defining syntax and semantics in a standardized way and testing microservices based on their ability to generate the right message formats and meet behavioral expectations, you can rest assured knowing that the microservices will behave as intended when deployed.

Ways to Test Microservices

It is easy to fall into the trap of making testing microservices complicated, but there are ways to avoid this problem. Testing microservices doesn’t have to be complicated at all when you have the right strategy in place.

There are several ways to test microservices too, including:

  • Unit testing: Which allows developers to test microservices in a granular way. It doesn’t limit testing to individual microservices, but rather allows developers to take a more granular approach such as testing individual features or runtimes.
  • Integration testing: Which handles the testing of microservices in an interactive way. Microservices still need to work with each other when they are deployed, and integration testing is a key process in making sure that they do.
  • End-to-end testing: Which⁠—as the name suggests⁠—tests microservices as a complete app. This type of testing enables the testing of features, UI, communications, and other components that construct the app.

What’s important to note is the fact that these testing approaches allow for asynchronous testing. After all, asynchronous development is what makes developing microservices very appealing in the first place. By allowing for asynchronous testing, you can also make sure that components or microservices can be updated independently to one another.

#blog #microservices #testing #caylent #contract testing #end-to-end testing #hoverfly #integration testing #microservices #microservices architecture #pact #testing #unit testing #vagrant #vcr

Camron  Shields

Camron Shields

1569557280

JavaScript Array - Check If Every Element Passes a Test: every()

In this tutorial, you will learn how to check whether all the array elements pass a test using the JavaScript Array every() method.

Checking array elements using the for loop

Sometimes, you need to test whether every element of an array satisfies a specified condition.

Typically, you use a for loop to iterate all elements and check each individual element against the condition. Suppose that you have an array numbers with three elements:

let numbers = [1, 3, 5];

The following code checks if every element in the numbers array is greater than zero:

let numbers = [1, 3, 5];
let result = true;
for (let i = 0; i < numbers.length; i++) {
    if (numbers[i] <= 0) {
        result = false;
        break;
    }
}
console.log(result);

Output:

true

How it works:

  • First, initialize the result variable to true.
  • Second, iterate over the elements of the numbers array and check whether each element is less than or equal zero. If it is the case, set the result variable to false and terminate the loop immediately using the break statement. In case no element is less than or equal zero, the value of the result variable remains true.

This code is simple and straight forward. However, it is quite verbose.

JavaScript Array type provides the every() method that allows you to check if every element of an array pass a test in a shorter and cleaner way.

Introduction to JavaScript Array every() method

Starting from ES5, JavaScript Array type provides a method every() that tests every element in an array.

The following example uses the every() to check if every element of the numbers array is greater than zero:

let numbers = [1, 3, 5];
let result = numbers.every(function (e) {
    return e > 0;
});

console.log(result);

Output:

true

By using the ES6 arrow functions, the code can be even shorter:

let numbers = [1, 3, 5];

let result = numbers.every( e  => e > 0);

console.log(result);

It is also much cleaner, isn’t it?

The following illustrates the syntax of the every() method.

arrayObject.every(callback[, thisArg])

The every() method accepts two named arguments: callback and thisArg.

#javascript #programming #developer #web-development

Software Testing 101: Regression Tests, Unit Tests, Integration Tests

Automation and segregation can help you build better software
If you write automated tests and deliver them to the customer, he can make sure the software is working properly. And, at the end of the day, he paid for it.

Ok. We can segregate or separate the tests according to some criteria. For example, “white box” tests are used to measure the internal quality of the software, in addition to the expected results. They are very useful to know the percentage of lines of code executed, the cyclomatic complexity and several other software metrics. Unit tests are white box tests.

#testing #software testing #regression tests #unit tests #integration tests