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1. Working with arrays in JS Working with arrays in JS

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   // The most perfomance way to populate a new array

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   [...Array(1000)].map((_, i) => i); // [0,...,999]

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   // Grouping array elements by condition

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   function groupBy(list, groupingCondition) {

2. NginX JSON Errors NginX JSON Errors

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   error_page 400 /400.json;

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   location /400.json {

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     internal;

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     default_type application/json;

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     return 400 '{ "code": 400, "message":"Bad Request" }';