JavaScript (JS) Is there a standard function to check for null, undefined, or blank variables

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Is there a standard function to check for null, undefined, or blank variables in JavaScript? Is there a standard function to check for null, undefined, or blank variables in JavaScript?
Is there a standard function to check for null, undefined, or blank variables in JavaScript Is there a standard function to check for null, undefined, or blank variables in JavaScript
Is there a standard function to check for null, undefined, or blank variables in JavaScript? Is there a standard function to check for null, undefined, or blank variables in JavaScript?
Is there a standard function to check for null, undefined, or blank variables in JavaScript? Is there a standard function to check for null, undefined, or blank variables in JavaScript?
Is there a standard function to check for null, undefined, or blank variables in JavaScript? Is there a standard function to check for null, undefined, or blank variables in JavaScript?
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