Tonye Onuoha

💡 𝗧𝗶𝗽 𝗼𝗳 𝘁𝗵𝗲 𝗗𝗮𝘆 — 𝗥𝗲𝗮𝗰𝘁

𝗗𝗶𝗱 𝘆𝗼𝘂 𝗸𝗻𝗼𝘄? In React, "useEffect" 𝗰𝗹𝗲𝗮𝗻𝘂𝗽 𝗳𝘂𝗻𝗰𝘁𝗶𝗼𝗻𝘀 𝗿𝘂𝗻 𝗯𝗲𝗳𝗼𝗿𝗲 𝘁𝗵𝗲 𝗻𝗲𝘅𝘁 𝗲𝗳𝗳𝗲𝗰𝘁 𝗮𝗻𝗱 𝗼𝗻 𝘂𝗻𝗺𝗼𝘂𝗻𝘁.

This means React will 𝗰𝗹𝗲𝗮𝗻 𝘂𝗽 𝘁𝗵𝗲 𝗽𝗿𝗲𝘃𝗶𝗼𝘂𝘀 𝗲𝗳𝗳𝗲𝗰𝘁 before...

💡 𝗧𝗶𝗽 𝗼𝗳 𝘁𝗵𝗲 𝗗𝗮𝘆 — 𝗗𝗷𝗮𝗻𝗴𝗼

𝗗𝗶𝗱 𝘆𝗼𝘂 𝗸𝗻𝗼𝘄? Django’s "F()" 𝗲𝘅𝗽𝗿𝗲𝘀𝘀𝗶𝗼𝗻𝘀 let you perform 𝗱𝗮𝘁𝗮𝗯𝗮𝘀𝗲-𝗹𝗲𝘃𝗲𝗹 𝗼𝗽𝗲𝗿𝗮𝘁𝗶𝗼𝗻𝘀 𝘄𝗶𝘁𝗵𝗼𝘂𝘁 𝗳𝗲𝘁𝗰𝗵𝗶𝗻𝗴 𝗱𝗮𝘁𝗮 𝗶𝗻𝘁𝗼 𝗣𝘆𝘁𝗵𝗼𝗻.

Instead of this:

- Fetch object

- Modify value

-...

💡 𝗧𝗶𝗽 𝗼𝗳 𝘁𝗵𝗲 𝗗𝗮𝘆 — 𝗥𝗲𝗮𝗰𝘁 𝗡𝗮𝘁𝗶𝘃𝗲

𝗗𝗶𝗱 𝘆𝗼𝘂 𝗸𝗻𝗼𝘄? In React Native, "onEndReached" in "FlatList" 𝗰𝗮𝗻 𝗳𝗶𝗿𝗲 𝗺𝘂𝗹𝘁𝗶𝗽𝗹𝗲 𝘁𝗶𝗺𝗲𝘀 𝘂𝗻𝗲𝘅𝗽𝗲𝗰𝘁𝗲𝗱𝗹𝘆.

This happens because it triggers based on scroll position — not just once when you hit...

💡 𝗧𝗶𝗽 𝗼𝗳 𝘁𝗵𝗲 𝗗𝗮𝘆 — 𝗝𝗮𝘃𝗮𝗦𝗰𝗿𝗶𝗽𝘁

𝗗𝗶𝗱 𝘆𝗼𝘂 𝗸𝗻𝗼𝘄? "Object.freeze()" makes an object 𝗶𝗺𝗺𝘂𝘁𝗮𝗯𝗹𝗲 — but only at the top level.

That means:

- You 𝗰𝗮𝗻𝗻𝗼𝘁 𝗮𝗱𝗱, 𝗿𝗲𝗺𝗼𝘃𝗲, 𝗼𝗿 𝗰𝗵𝗮𝗻𝗴𝗲 properties on the frozen object

- But 𝗻𝗲𝘀𝘁𝗲𝗱...