I’ve a question about block lambda. What will be the output of the console for
this code :
let numbers=[1,2,3,4,5,6];
let isPair=function(x) {
console.log(x); return (x&1)==0;
}
function getAnyWhere(elements, isValid) {
elements.forEach({(x) if(isValid(x)) return x; });
}
let fv = getAnyWhere(numbers, isPair);
console.log(fv);
One could resume my question in three smaller ones :
(1) does the first 'block lambda return’ returns its value to fv directly.
(2) does the first ‘block lambda return’ aborts the forEach
(3) does the second ‘block lamdba return’ (if any) causes an error to be thrown
(4) does the execution of console.log(fv) continue in parallel with the
following forEach iterations
To be useful, I think the behavior should be
(1) yes
(2) yes
(3) doesn’t happen; see 2.
(4) doesn’t happen; see 2.
However, it seems rather complex since the “forEeach” function could be any
host function that was not mean to be aborted at any given time by callee.
If the response to (1) is no, I don’t see the point of ‘return’ returning from
parent function. Did I miss something?
François_______________________________________________
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