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29 lines
765 B
Markdown
29 lines
765 B
Markdown
# The Event Loop
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JavaScript is single-threaded but it can still take advantage of asynchronous
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programming.
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In order to do that, the runtime keeps a structure called The Event Loop which
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is responsible for holding operations to be executed asynchronously with
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respect to the main flow of execution. Whenever we meet a portion of code that
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may not be possible to execute now, it is put in the Event Loop. Let's look at
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some examples:
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1.
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```javascript
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setTimeout(() => console.log('test'), 1000);
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```
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`console.log('test')` will be put in the Event Loop.
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2.
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```javascript
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const promise = new Promise(function (resolve, reject) {
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console.log('test');
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resolve();
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}).then(() => {
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console.log('test2');
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});
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```
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`console.log('test2')` will be put in the Event Loop. |