I am calling two functions and checking if the given input has barcode and qr code
var decode = jsQR.decodeQRFromImage(rawImageData.data, rawImageData.width, rawImageData.height);
checkBarCode(function(err, result) {
if (result) {
Result.pages.push({
ValidTicket: decode ? true : false //here i want to assign true or false if barcode or qr code is present.
});
}
});
is this correct?
ValidTicket: decode || result ? true : false
Your assignment does work correctly, but I might suggest using two boolean NOT operators instead, which is slightly terser:
var decode = jsQR.decodeQRFromImage(
rawImageData.data,
rawImageData.width,
rawImageData.height
);
checkBarCode(function(err, result) {
if (result) {
Result.pages.push({
ValidTicket: !!(decode || result)
});
}
});
Yes, that's correct. If either decode or result is truthy*, you'll assign true; if both are falsy*, you'll assign false.
You may get someone telling you to just do this:
ValidTicket: decode || result
...but that won't necessarily assign either true or false, because of JavaScript's curiously-powerful || operator (that's a post on my anemic little blog); instead, it'll assign the value of decode if it's truthy, and the value of result if not. So if you really need true or false, you need to use the conditional as you have done.
* About "truthy" and "falsy":
"truthy" - a value that coerces to true when used as a boolean
"falsy" - a value that coerces to false when used as a boolean
The falsy values are 0, "", NaN, null, undefined, and (of course), false. All other values are truthy.