![]() What the exclamation mark does in TypeScript For example, if we define a variable as possibly a string or undefined, the ! operator tells the compiler to ignore the possibility of it being undefined. ![]() The non-null assertion operator tells the TypeScript compiler that a value typed as optional cannot be null or undefined. Alternatives to using the TypeScript exclamation mark.The downside of using the exclamation mark in TypeScript.Popular use cases for the TypeScript exclamation mark.What the exclamation mark does in TypeScript.What is the TypeScript exclamation mark?.We will be using these terms interchangeably in this article. The exclamation mark ! is known as the non-null assertion operator in TypeScript. Understanding the exclamation mark in TypeScript When she's not writing code, she likes to read, listen to music, and put cute outfits together. Ibiyemi Adewakun Follow Ibiyemi is a full-stack developer from Lagos.
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