Just JavaScript Tutorials - Medium

Is Negative Zero (-0) a Number in JavaScript?

Dr. Derek Austin — Tue, 10 Feb 2026 21:19:30 GMT

JavaScript has a feature called signed zeroes, where positive zero (+0) is the same as unsigned zero (0), but negative zero (-0) is …

Dr. Derek Austin — Tue, 10 Feb 2026 21:19:10 GMT

To remove an object key from a JavaScript object, you can’t use the assignment operator (=). Instead, you need to learn the rules for the…

Dr. Derek Austin — Tue, 10 Feb 2026 21:15:36 GMT

Loading an external script directly from the console can be tricky. Here is how to import JavaScript without a script tag directly from…

Dr. Derek Austin — Tue, 10 Feb 2026 21:15:13 GMT

Need unique values in JavaScript? That’s where the Set object comes in. Here’s how to use Set to filter a list of unique primitive values…

Dr. Derek Austin — Tue, 10 Feb 2026 21:03:40 GMT

Do you know if these JavaScript code blocks are equivalent? Test your knowledge about shorthand method and property names.

Dr. Derek Austin — Tue, 10 Feb 2026 21:03:30 GMT

These “fancy strings” interpolate variables, avoid the need to escape quote characters, and allow multi-line strings without the \n…

Dr. Derek Austin — Tue, 10 Feb 2026 21:02:58 GMT

Checking for NaN (“not a number”) is as simple as checking for self-equality in JavaScript.

Dr. Derek Austin — Tue, 10 Feb 2026 20:58:51 GMT

The default ECMAScript sort is alphabetical, so a little magic is needed to sort an array in numerical order.

Dr. Derek Austin — Tue, 10 Feb 2026 20:58:26 GMT

Numbers are a primitive type in JavaScript, but just using typeof will not differentiate numbers from NaN or Infinity.

Dr. Derek Austin — Tue, 10 Feb 2026 20:56:58 GMT

I demonstrate how to use .indexOf and .splice to remove an item from an array. Then I compare performance with a for loop and the .filter…