Hey everyone!
I’m taking on the #100DayCodeChallenge!
Over the next 100 days, I’ll be sharing my journey, knowledge, and experiences.
Stay tuned for regular updates!
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Day 1:
Today I learned about “Promises” in JS.
Definitions :
- Promises : A way to handle asynchronous operations. ( put simply: They represent a value that might be available now, in the future, or never. ) => formally noted as pending, fulfilled, or rejected.
- Asynchronous operations : Allow a task to start, continue doing other things, and then finish later. They don’t block or stop the program from running other code in the meantime.
Initializing a Promise :
- using const : const = constant. Use const when you know you won’t change the promise.
- using let : let = let this variable change if needed. Use let when you think you might need to change the promise to something else.
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Day 2:
Arrow Functions:
When to use:
- For quick, simple functions.
- To ensure
thisis lexically scoped, especially in callbacks: Like a robot that remembers its owner even if told to do something later. - When you don’t need a function with its own
argumentsorthiscontext: Like a robot doing a simple task without needing extra tools.
When not to use:
- When creating a constructor function.
- If
thisneeds to be dynamic within the function: Like a robot that can change its owner based on who is using it. - If you need the
argumentsobject: Like a robot that needs to know information outside the task to complete the assigned task.
Summary
- Use arrow functions when you have simple tasks that don’t need special tools or changing owners.
- Don’t use arrow functions when you need to see all the arguments or change the robot’s owner (
this).
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