After making an AJAX call, I passed a collection of JSON objects. Among the datasets I received, some include the field C while others do not. Whenever I try to execute the following code snippet, it causes the system to crash. I attempted using both undefined and null, but unfortunately, they also resulted in crashes.
if (myJsonObjects[i].C == undefined) {
// …
}
It seems like by "crash" you are referring to the error message
TypeError: cannot read property of undefined valueThis issue occurs because in this line:
if(myJsonObjects[i].C == undefined){We should actually be checking if myJSONObject[i] === undefined
Therefore, it is important to verify your array boundaries or ensure that your array is not sparse
When checking for undefined values in objects within an array like myJsonObjects[i], using the condition 'if(myJsonObjects[i].C == undefined)' can be replaced with a more concise statement: 'if(myJsonObjects[i] && myJsonObjects[i].C)'. This updated line not only checks if myJsonObjects[i] exists, but also ensures that myJsonObjects[i].C is not null or undefined.It's important to note that this approach may still result in issues if myJsonObjects[i].C holds values such as false, "", 0, or NaN.
Here is a suggestion:
if (typeof myJsonObjects[index].C == 'undefined') {}
Before diving in headfirst, it might be a good idea to dip your toes in first:
if( i is within the myJsonObjects && myJsonObjects[i] exists && !( "C" is within myJsonObjects[i] ) ) { }
Nevertheless, your original code should not crash or throw an error if myJsonObjects[i] is defined and not null.
What do you think of this approach?
if ('C' is present in myJsonObjects[i]) { perform_your_magic() }
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