How to check variable is null or undefined?

To check for null or undefined in TypeScript, use a comparison to check if the value is equal or is not equal to null or undefined.

Check example below:

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How to filter numeric value and remove if 1st character is zero?

In below example will see how to filter numeric value (1-9) and remove all unnecessary characters and if 1st character is zero from a string by using regular expression and charAt method.

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How to filter numeric value and remove all unnecessary characters?

In below example will see how to filter numeric value (0-9) and remove all unnecessary characters from a string by using regular expression.

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How to check an Object if value exists JavaScript?

In objectItems variable has some array of items. I have checked and compaire productId exists and productId equal 2 in object objectItems?

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How to check an Object if multiple value exists in Object items?

This is work for me. Here in objectItems has some array of object items. I have checked and compaire eventId and productId exists and eventId equal 5 & productId equal 10 in object objectItems?

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