TypeScript tutorialLesson 5Free preview

TS Explicit & Inference

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Summary

Type inference is the ability of TypeScript to guess the type of a value without explicit annotation. Explicit annotation is used when the type needs to be known beforehand or ambiguous initial values such as null. The combination of the two makes the code compact yet secure.

Key points

Inference guesses the type of the initial value
The explicit annotation is written with colon
The number variable must not be filled with the value of the string

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