Recently, I came across this code snippet:
fixture.componentInstance.dataSource!.data = [];I am intrigued by the syntax dataSource!.data and would like to understand its significance.
While familiar with using a question mark (?) before a dot (.) as in key1?.key2, the exclamation point (!) preceding the dot (.) in the expression !. has piqued my interest.
Any insights or explanations would be greatly appreciated!
The Non-null Assertion Operator is a helpful tool in TypeScript
By removing null and undefined, it allows you to confidently assert that a value will be present. While generally considered a code smell, there are specific cases where this operator can come in handy when other methods like type narrowing are not feasible.
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