I want return an empty object meanwhile the object equals to boolean false in my function. Obviously,if I return {} like the code below,it equals to boolean true which cannot meet my request.
decodeAndParse: function (jsonStr) {
if (this.NaEptStr(jsonStr)) {
var result;
result = decodeURIComponent(jsonStr);
result = JSON.parse(result);
return result;
}
return false;
}
Your code can be:
decodeAndParse: function (jsonStr) {
return this.NaEptStr(jsonStr)? JSON.parse(decodeURIComponent(jsonStr)) : {};
}
Then in the calling code you probably have something like:
var obj = foo.decodeAndParse(jsonStr);
if (obj) {
...
}
You could have a simple "emptyObj" test like:
function isEmptyObject(obj) {
return !!Object.keys(obj).length;
}
Then in the caller:
if (isEmptyObject(obj)) {
If you need to shim Object.keys, see MDN. Note that IE8 still has a significant user share (greater than 20% of desktop browsers according to netmarketshare) so don't ignore non–ES5 browsers.
if (returnedValue) will always evaluate to true if returnedValue is an object (even a Boolean object with a value of false) per the rules in ECMA-262. You can't change that. So you need to evaluate the returned value differently using one of the methods suggested in the answers (or others).make a function that counts keys in object
function isNotEmpty(obj){
var count = 0;
for (var k in obj) {
if (obj.hasOwnProperty(k)) {
++count;
}
}
return count ? true : false;
}
and modify your if to
if (isNotEmpty(this.NaEptStr(jsonStr)))
But the simplest way to check if required field in object is present
if(this.naEpStr(jsonStr).myRequiredField)
return true in the if branch.
objectand make decisions on that likeif (this.NaEptStr(jsonStr)) { result.status=true; return result}else{return {status:false}}