Undefined Is Not Null: There Is a Difference – JavaScript Developer Humor Coffee Mug
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$12.09
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$12.09
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- Coffee, tea, or art? Have it all with this eye-opening ceramic mug
- Holds 11.8 US fl. oz. (350 ml)
- Mug diameter is 3.2" (8.2 cm), not including handle
- Dishwasher and microwave safe ceramic
- Wraparound design printed for you when you order
- Since every item is made just for you by your local third-party fulfiller, there may be slight variances in the product received
Undefined Is Not Null: There Is a Difference – JavaScript Developer Humor
undefined !== null // there is a difference. Every JavaScript developer has been bitten by this one: two values that look like “nothing” but aren’t the same thing, and a strict equality operator that knows it. This design shows the comparison as a block of code in terminal green and red, with the punchline written as a code comment.
Made for web developers, frontend engineers and anyone who has ever debugged a “cannot read properties of undefined” error at 2 a.m. A good fit for code review survivors, team chats and coworker gift swaps.
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