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Need a simple explanation of the inject method

I'm looking at this code but my brain is not registering how the number 10 can become the result. Would someone mind explaining what's happening here? ...
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Maintain aspect ratio of div but fill screen width and height in CSS?

... breaking the ratio and without scrollbars! (PURE) CSS div { width: 100vw; height: 56.25vw; /* height:width ratio = 9/16 = .5625 */ background: pink; max-height: 100vh; max-width: 177.78vh; /* 16/9 = 1.778 */ margin: auto; position: absolute; top:0;bottom:0; /* ve...
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Merge Images Side by Side(Horizontally)

I have five images of sizes: 600x30, 600x30, 600x30, 600x30, 810x30. Their names are: 0.png, 1.png, 2.png, 3.png, 4.png, respectively. ...
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Rails detect if request was AJAX

... | edited Jul 10 '15 at 16:46 answered Nov 22 '11 at 1:08 ...
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How to show SQL queries run in the Rails console?

... | edited Jul 25 '18 at 0:36 morhook 48455 silver badges1515 bronze badges answered May 29 '10 at 17:4...
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How to calculate the number of occurrence of a given character in each row of a column of strings?

... 2 #2 2 magic 1 #3 3 not 0 share | improve this answer | follow | ...
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Why doesn't println! work in Rust unit tests?

...in.rs; ./main running 1 test test test ... ok test result: ok. 1 passed; 0 failed; 0 ignored; 0 measured % ./main --nocapture running 1 test Hidden output test test ... ok test result: ok. 1 passed; 0 failed; 0 ignored; 0 measured % cargo test -- --nocapture running 1 test Hidden output test ...
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Crontab Day of the Week syntax

In crontab does the Day of the Week field run from 0 - 6 or 1 -7 ? 3 Answers 3 ...
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Best way to format integer as string with leading zeros? [duplicate]

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Drawing an image from a data URL to a canvas

...t('2d'); var img = new Image; img.onload = function(){ ctx.drawImage(img,0,0); // Or at whatever offset you like }; img.src = strDataURI; Edit: I previously suggested in this space that it might not be necessary to use the onload handler when a data URI is involved. Based on experimental tests f...