How to Use Logical OR for Defaults
a || b when falsy. Fast. But 0 and '' become b.
@JavaScriptBuzz
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Your daily hit of JavaScript hacks, fixes, and mind popping tricks
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You Can Use Same Variable Name TWICE?!
🔥 NO WAY! Destructuring allows DUPLICATE variable names in the same statement! const {a, a} = obj is VALID JavaScript! Last one silently wins. ESLint doesn't catch this by default. Tag a dev who needs to see this!
#javascript #javascripttricks #codingchallenge #destructuring #javascriptes6 #javascriptquiz #javascriptweird #javascriptwtf #javascriptbugs #codinginterview #codingtips #javascriptshorts
You Can Use Same Variable Name TWICE?! #codingchallenge
How to Use Proxy to Trap Property Access
Proxy intercepts get/set. Validation. Logging. Magic.
How to Use Proxy to Trap Property Access #howto
How to Make Array Lookups 1000x Faster
Set has O(1) lookup. Array has O(n). One change. Instant.
How to Make Array Lookups 1000x Faster #howto
How to Prevent setTimeout Drift in Loops
setTimeout inside loops is not precise.
How to Prevent setTimeout Drift in Loops #howto
Why does this JavaScript sort put 10 before 2?
Why does this JavaScript sort put 10 before 2 in a leaderboard. The JavaScript code uses sort without a comparator, so numbers are sorted as strings. In JavaScript apps this breaks every numeric ranking.
#whatswrongwiththisjavascriptcode #javascriptbug #javascriptproductionbug #javascriptdebugging #javascriptbackend #javascriptcodereview #javascriptsecurity #javascriptperformance #javascriptreliabili...
Why does this JavaScript sort put 10 before 2? #javascriptengineering
What's wrong with this JavaScript parseInt losing digits?
What's wrong with this JavaScript parseInt losing digits on user input. The JavaScript code parses a string without radix, so leading zeros trigger octal in older engines. In JavaScript APIs this corrupts IDs.
#whatswrongwiththisjavascriptcode #javascriptbug #javascriptproductionbug #javascriptdebugging #javascriptbackend #javascriptcodereview #javascriptsecurity #javascriptperformance #ja...
Whats wrong with this JavaScript parseInt losing digits? #javascriptreliability
What's wrong with this JavaScript unhandled rejection?
What's wrong with this JavaScript unhandled rejection crashing Node. The JavaScript code returns a promise without catch. In JavaScript unhandled rejections can terminate the process.
#whatswrongwiththisjavascriptcode #javascriptbug #javascriptproductionbug #javascriptdebugging #javascriptbackend #javascriptcodereview #javascriptsecurity #javascriptperformance #javascriptreliability #javascri...
Whats wrong with this JavaScript unhandled rejection? #javascriptreliability
What's wrong with this JavaScript this in callback?
What's wrong with this JavaScript this in a callback losing context. The JavaScript code passes a method as callback and this becomes undefined. In JavaScript event handlers the method loses its instance.
#whatswrongwiththisjavascriptcode #javascriptbug #javascriptproductionbug #javascriptdebugging #javascriptbackend #javascriptcodereview #javascriptsecurity #javascriptperformance #javascriptrel...
Whats wrong with this JavaScript this in callback? #javascriptclass
What's wrong with this JavaScript async loop?
What's wrong with this JavaScript async loop in a task runner. The JavaScript code uses forEach with async callbacks, so errors and awaits are ignored. In JavaScript services this drops failures and hides retries.
#whatswrongwiththisjavascriptcode #javascriptbug #javascriptproductionbug #javascriptdebugging #javascriptbackend #javascriptcodereview #javascriptsecurity #javascriptperformance #javascript...
