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isInitialized

Checks whether an encrypted value has been initialized (i.e., is not a zero/empty handle). Works on all encrypted types. 
if (FHE.isInitialized(encryptedBalance)) {
    // safe to use
}

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unwrap

Extracts the raw bytes32 handle from a typed encrypted value. 
bytes32 handle = FHE.unwrap(encryptedValue);

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wrap

Wraps a raw bytes32 handle into a typed encrypted value. One function per type: 
ebool val    = FHE.wrapEbool(handle);
euint8 val   = FHE.wrapEuint8(handle);
euint16 val  = FHE.wrapEuint16(handle);
euint32 val  = FHE.wrapEuint32(handle);
euint64 val  = FHE.wrapEuint64(handle);
euint128 val = FHE.wrapEuint128(handle);
eaddress val = FHE.wrapEaddress(handle);
Use wrap when you have a raw handle from storage or an event and need to convert it back to a typed encrypted value.

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Random Number Generation

Generate random encrypted values. An optional securityZone parameter is supported. 
euint8 rand   = FHE.randomEuint8();
euint16 rand  = FHE.randomEuint16();
euint32 rand  = FHE.randomEuint32();
euint64 rand  = FHE.randomEuint64();
euint128 rand = FHE.randomEuint128();

// With security zone
euint32 rand = FHE.randomEuint32(1);