![Add a subheading.jpg](https://cdn.steemitimages.com/DQmNn87Hnjrnvg5CSwnsWGEgNGibKLFcyz6x79pP2x73B6Y/Add%20a%20subheading.jpg) _{Image taken from [Pixabay](https://pixabay.com/photos/code-coding-computer-data-1839406/)} Hello everybody. This is my participation post for SLC Week 2, Domain Steem with JavaScript created by @alejos7ven! Before starting on the homework tasks, I had to install NodeJS, as I had Visual Studio Code on my PC already. You can download it from the official website, either by running commands in PowerShell or get a prebuilt installer for your machine. You can choose Windows, Linux, macOS or AIX and the specific architecture. I went for Windows x64. ![image.png](https://cdn.steemitimages.com/DQmWwApzRqxEBUznKaHqBNGmKxRxcN1ZRAC84W9hnzXVvBb/image.png) _{Node.JS download page} The installation is pretty straight forward, just follow the steps. After the install is done, we can check the version via CMD, with the ```node``` command. ![image.png](https://cdn.steemitimages.com/DQmZuovQovuode7jeQhkaPgx933LucmXjVa1TPErGVgBzo7/image.png) _{Node.JS version check} To run Node.js scripts like STEEM JS using Visual Studio Code. After the whole installation process, I created a new folder, in which I opened a CMD terminal and ran the command to install the STEEM JS Library: ```npm install steem --save```. With all this done, I could start working on the tasks. Now, without further ado, let's get started. |Task 1: Use Steem JS to execute at least 3 methods from Steem API| |--|

Method 1: ```getTrendingTags```

The ```getTrendingTags``` can be used to retrieve information about the trending tags such as: name, number of comments, number of top posts, total payouts. In the code, you can set how many tags you want find, in my case it's 5: ![getTrendingTags.png](https://cdn.steemitimages.com/DQmPuJ9WakYTwW48RPrCeM2zeDr6u4c1pZeS375nyqnRdkF/getTrendingTags.png) The result is a JSON that contains the 5 trending tags and the specific data for them: ![image.png](https://cdn.steemitimages.com/DQmQq2rPyzUS726kDytN7SioGMvKh7zBUmrFTiaYJ9MDiQb/image.png)

Method 2: ```getBlogEntries```

The second method, ```getBlogEntries``` is used to extract information about a specific number of posts from a users blog starting from a particular point. Can be useful when you want to see data about older posts. In my case, I am using this method to find information about blog entries from 4 to 7, as 7 is the starting point and it will go backwards 4 positions: ![image.png](https://cdn.steemitimages.com/DQmSNr7PJs4pWqKxoBZ3kUAXEqhquDa4MxUM4ENVtbFPkny/image.png) _{The code used}
![image.png](https://cdn.steemitimages.com/DQmSfykBP6z9QwcPD1Rki6vssGNkYcZLRRrWwDDNXsHA9rN/image.png) _{The result}

Method 3: ```lookupAccountNames```

For the third method, I chose ```lookupAccountNames``` which allows me to see detailed information about a list of Steem accounts. You can also check if certain account names exists. I declared a variable where I specified 2 account names I would like to find information about. For demonstrating how this works, I used my own account and one that does not exists. ![accountnames.png](https://cdn.steemitimages.com/DQmUuH6SBKcNUn5ETkWT3jFmncmPGLhyj4Rt1PhbNJqqTiF/accountnames.png) And this is the JSON it returned. As you can see, for my account the API can find information but for the not existing one it returns ```null```: ![image.png](https://cdn.steemitimages.com/DQmYVTqsLrMM1ogGziJWM7K9tWGo46ib8JcuP2mBt9vFVwB/image.png) |Task 2: Calculate the effective SP (vesting_shares+received_vesting_shares-delegated_vesting_shares-vesting_withdraw_rate) for all Steemcurator accounts (sc01-08)| |--| Before we can calculate the SP, we need to find the necessary variables. As a small test, I ran the ```getAccounts``` method with my name and extracted the variables. This is the code + the result for my account: ![image.png](https://cdn.steemitimages.com/DQmRwj2WbBidGLk4FfyXm8ojRrrd6h24nGKR2dygeXvTwuJ/image.png) Now, let's do this for all of the steemcurator's accounts. We also need to use the ```getDynamicGlobalProperties``` method so we can get mvests. This is how the final version of the code looks like: ![image.png](https://cdn.steemitimages.com/DQmbapEX1qBbR3SX63U3hUY3tMLocsVLbvEtfWcJWh2TF22/image.png) And this is the result, with 4 digits: ![image.png](https://cdn.steemitimages.com/DQmdMCFRVRaX31jBhz9kis1ikYY4JLXe9mhKtLcrgC4SfTH/image.png) |Task 3: Study the get_dynamic_global_properties method and explain at least 5 values we can get here. Use this site: https://developers.steem.io/tutorials-recipes/understanding-dynamic-global-properties| |--| My choice of 5 values: - ```current_sbd_supply``` This property represents the total amount of SBD currently in circulation. When running the code, we see that the supply is: 13924765.512 SBD -```virtual_supply``` is the sum of the all STEEM supply + all SBD supply, if SBD is converted to STEEM at the current median price. At the moment, it would be: 532986348.526 STEEM - ```current_witness``` is used to find the account name of the current witness. In this case its: dhaka.witness - ```head_block_number```: it's value represents the number of the last block that was added in the blockchain. A new block is generated every few seconds - ```sbd_interest_rate```: represents the interest rate paid on SBD moved into savings, currently set at 0%
As always, thank you for reading and I'd like to extend an invitation to @r0ssi, @radudangratian and @cmalescov to take part in this.