Typescript Foreach

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The for-in statement is really there to enumerate over object properties, which is how it is implemented in TypeScript. There are some issues with using it on arrays .

A common error experienced by beginning JavaScript developers is that for...in for an array does not iterate over the array items. Instead it iterates over the keys of the object passed in. This is demonstrated in the below example. Here you would expect 9,2,5 but you get the indexes 0,1,2 :

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