Why Does My `console.log` Show Different Array Lengths and Object Values After Splicing?

Weird Behavior with Objects & Console.log

The provided code exhibits peculiar output in Chrome Console. Why is an array of five objects displayed before and after splicing an element, with the length showing a different value?

Explanation:

Console.log treats object examination asynchronously. While the console receives a reference to the object immediately, it doesn't show its properties until expanded. If the object is modified before expansion, the displayed data reflects the updated values.

Chrome Console Behavior:

Chrome Console indicates this behavior with an "i" in a box, hovering over which reveals the following message: "Object value at left was snapshotted when logged, value below was evaluated just now."

Overcoming the Issue:

To mitigate this issue, consider the following strategies:

• Log individual values: console.log(obj.foo, obj.bar, obj.baz);
• JSON encode the object: console.log(JSON.stringify(obj));
• Re-encode the JSON: console.log(JSON.parse(JSON.stringify(obj)));

Note that JSON removes non-serializable properties like functions and DOM elements, and may fail on circular references. Therefore, it's recommended to use an intelligent deep copy variant for such objects.

The above is the detailed content of Why Does My `console.log` Show Different Array Lengths and Object Values After Splicing?. For more information, please follow other related articles on the PHP Chinese website!