Why does parseInt yield NaN with Array#map?

javascript
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Is it possible to append to innerHTML without destroying descendants' event listeners?

javascripthtmldom-eventsinnerhtml
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How do I test for an empty JavaScript object?

javascriptjavascript-objects
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How can I add a key/value pair to a JavaScript object?

javascriptobject-literal
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How to insert an item into an array at a specific index (JavaScript)

arraysjavascript
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