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* useful reference starting out https://www.typescriptlang.org/docs/handbook/basic-types.html
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declare can be used to get around a libraries syntax that you dont have a chance to type.
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* ex) for lodash you have to do the following:
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- declare var _ as * from
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* ex) declare var Window:any = window;
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`declare let _ :any`
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* ex) `declare var Window:any = window;`
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On ngFor you must initialize to have an initial value:
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*ex) private books: any = [{}];
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