Hi team,
I’d like to add a new section of ninja-level JavaScript questions for advanced learners and interview prep. These questions are tricky, edge-case, or uncommon topics that even experienced developers often get wrong.
Some example questions I propose:
- Why does
console.log(a); var a = 10; print undefined? Explain hoisting.
- Explain why
[] == ![] evaluates to true.
- Difference between
NaN === NaN and Object.is(NaN, NaN).
- What will
for(var i=0;i<3;i++){ setTimeout(()=>console.log(i),1000); } print and why?
- Explain why
typeof null returns "object".
- What will
console.log([] + {}) print? Why?
- Explain sparse arrays like:
let a=[1,2,3]; a[10]=99; console.log(a.length);
I can contribute a full list of 20–30 ninja-level JS questions with explanations for the repo if approved.
Thanks!
Hi team,
I’d like to add a new section of ninja-level JavaScript questions for advanced learners and interview prep. These questions are tricky, edge-case, or uncommon topics that even experienced developers often get wrong.
Some example questions I propose:
console.log(a); var a = 10;printundefined? Explain hoisting.[] == ![]evaluates totrue.NaN === NaNandObject.is(NaN, NaN).for(var i=0;i<3;i++){ setTimeout(()=>console.log(i),1000); }print and why?typeof nullreturns"object".console.log([] + {})print? Why?let a=[1,2,3]; a[10]=99; console.log(a.length);I can contribute a full list of 20–30 ninja-level JS questions with explanations for the repo if approved.
Thanks!