Learn JavaScript
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Checking whether a variable is NaN or not with JavaScript

https://javascript.plainenglish.io/how-to-check-that-a-number-is-nan-in-javascript-792a276f1aee

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See an example of using Abort Controller to cancel execution of setTimeout

https://www.bennadel.com/blog/4195-using-abortcontroller-to-debounce-settimeout-calls-in-javascript.htm

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Several ways to pause command execution in JavaScript

https://stackabuse.com/javascript-how-to-sleepwaitdelay-code-execution/
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Using private properties in JavaScript classes

https://davidwalsh.name/javascript-class-privates

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Comparison of design pattern in using
Switch with if else in JavaScript

https://javascript.plainenglish.io/switch-vs-if-else-7f7617bfe8cb

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#nan #switch #ifelse #private #class #abort