How to check if object is undefined in typescript

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  A ball is fired from a sling shot. The initial velocity is 2.25 m/s at 22.5. What are the vertical and horizontal components of the ball's initial velocity as it leaves the sling shot?

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  Ets2 iInvalid floating point value '&7fc00000'

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  Does any event get triggered when checked value changes programatically?

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  Error TS2564: Property 'description' has no initializer and is not definitely assigned in the constructor. in angular class

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  Error on indexing the object in ts

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  Positional arguments dart

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