Type Utilities

Requirements

• Provide the six named exports isBoolean, isNumber, isNull, isString, isSymbol, and isUndefined. Each accepts any value and returns a boolean.
• isBoolean accepts only the primitive values true and false. isString accepts primitive strings, including the empty string.
• isNumber accepts every number primitive, including NaN, positive and negative infinity, and signed zero. It rejects numeric strings and BigInt.
• isNull accepts only null; isUndefined accepts only undefined. These values are different.
• isSymbol accepts symbol primitives. Reject boxed Boolean, Number, String, and Symbol objects.
• Do not coerce the value, execute functions, or read object properties to determine its type.

Examples

Input: isNumber(NaN);
Output: true

Input: isNumber("42");
Output: false

Input: isNull(null);
Output: true

Input: isBoolean(new Boolean(false));
Output: false