While reviewing the Vue.js source code, I came across a contentious if statement. This part defines a reactive setter for a property.
if (newVal === value || (newVal !== newVal && value !== value)) {
return
}
I have consulted this strict equality description but still struggle to grasp the usefulness of such a comparison.
(newVal !== newVal && value !== value)
When a variable like `newVal` is not a number (`NaN`) and is not equal to itself, and a variable like `value` is also not a number (`NaN`) and is not equal to itself, the statement <code>(newVal !== newVal && value !== value)However, when the variables `newVal` and `value` are both `NaN` (not a number), the expression (newVal === value) would be false, indicating they are not equal.
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