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There are certain files created by particular editors, IDEs, operating systems, etc., that do not belong in a repository. But adding system-specific files to the repo's .gitignore is considered a poor practice. This file should only exclude files and directories that are a part of the package that should not be versioned (such as the node_modules directory) as well as files that are generated (and regenerated) as artifacts of a build process.

All other files should be in your own global gitignore file. Create a file called .gitignore in your home directory and add anything you want to ignore. You then need to tell git where your global gitignore file is.

Mac

git config --global core.excludesfile ~/.gitignore

Windows

git config --global core.excludesfile %USERPROFILE%\.gitignore

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Create a new repository on the command line

echo "# glare-loading-animation" >> README.md

git init

git add README.md

git commit -m "first commit"

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Regular Event Loop

This shows the execution order given JavaScript's Call Stack, Event Loop, and any asynchronous APIs provided in the JS execution environment (in this example; Web APIs in a Browser environment)

---

Given the code

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[
    {
        "city": "New York", 
        "growth_from_2000_to_2013": "4.8%", 
        "latitude": 40.7127837, 
        "longitude": -74.0059413, 
        "population": "8405837", 
        "rank": "1", 
        "state": "New York"
    }, 

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// GET
function getData(url, headerData) {
    var xhr = new XMLHttpRequest();
    xhr.onreadystatechange = function() {
        // only run if request is complete i.e. 4 == done
        if (xhr.readyState !== 4) return;
        if (xhr.status == 200) {
            console.log('success', JSON.parse(xhr.responseText));
        } else {
            console.log('error', xhr);

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/*resets*/
.main-wrapper {
    margin: 0;
    padding: 0;
    border: 0;
    font-size: 100%;
    font: inherit;
    vertical-align: baseline;
    -webkit-box-sizing: border-box;
    box-sizing: border-box;

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(function(originalSend){
    XMLHttpRequest.prototype.send = function (data) {
    	// your custom code here
        originalSend.call(this, data);
    };
})(XMLHttpRequest.prototype.send);

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* {
  background: #000 !important;
  color: #0f0 !important;
  outline: solid #f00 1px !important;
}