I just got this script for debugging and have no idea what this following section means.
var qns = () => site + status + "\
"
let status = "true";
The variable status has not defined before.
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Please provide your scriptashokhein– ashokhein2014-09-24 05:14:21 +00:00Commented Sep 24, 2014 at 5:14
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ECMAScript 6 support in MozillaTeemu– Teemu2014-09-24 05:23:56 +00:00Commented Sep 24, 2014 at 5:23
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1 Answer
This is JavaScript 1.7, available currently on Firefox, but not on most other browsers.
var qns = () => site + status + "\
"
is equivalent, but shorter than:
var qns = function() {
return site + status + "\n";
}
(not sure if newline is valid or not). Arrow functions on MDN
let status = true is same as var status = true aside from the scope: it will only be declared for the containing block. For example,
if (true) {
var x = 1;
let y = 2;
console.log(x); // => 1
console.log(y); // => 2
}
console.log(x); // => 1
console.log(y); // => undefined
By the way, the variable status does not need to be declared before your line; it is enough if it is declared before qns() is invoked later. let statement on MDN
