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Robert O'Toole
6,366 Pointsconfused about catch method
.catch(err=>console.log(err));
how does .catch know that err is a function? how does it know what to log when we simply put log(err)... i wish guil explained some of these parameters a bit better instead of just typing them in
3 Answers
Robert O'Toole
6,366 Pointsit is an implicit function. i am just finally grasping all of this because i ventured out of treehouse for a bit. but you guys need to require the ECSM2015 course in the front end track... you guys also should really go into more detail about .map, .filter etc so we can see example of this.
not once in the course was this kind of function writing done and now all of a sudden its been added as a regular way of writing functions. when were arrow functions really covered? when were implicit functions really covered? they weren't.... the jump from beginner to intermediate level stuff was immense and not really practical for anyone who solely focuses on on their studying through these courses. in other words you guys really need to update the front end track... i understand we need to venture out for other resources but i just started taking a course on udemy and the linear fashion of teaching this stuff is way more approachable. half the course uses var and then we all of a sudden start using const, constructors, and things we were never even taught. the OOJS stuff comes after this content which doesn't really make sense. sorry to rant but this needs to be said
Steven Parker
231,269 PointsThe identifier err in that snippet isn't a function, it's a parameter for the function. The function itself is anonymous (has no name).
And catch is designed to take a function as its parameter, so it is expecting it.
For more details on syntax and usage, see the MDN page for Promise.prototype.catch().
Robert O'Toole
6,366 Pointsokkk i got it! thanks
Steven Parker
231,269 PointsSteven Parker
231,269 PointsRobert O'Toole — Normally the "best answer" mark would go on the answer that helped most towards answering your question (instead of on your own comments).