Function isDefined

Checks if the passed value is defined, which means it has any value and is not undefined. A string value of "undefined" is considered to be defined.

Example

isDefined(null);         // false
isDefined(undefined);    // false
isDefined("undefined");  // true

let value = null;
isDefined(value);        // false
let value = undefined;
isDefined(value);        // false

isDefined("");           // true
isDefined(0);            // true
isDefined(new Date());   // true
isDefined(true);         // true
isDefined(false);        // true
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