| Concat(ReadOnlySpanReadOnlyMemoryChar) | Concatenates the items of a read-only span of read-only character memory regions to a String. |
| Concat(ReadOnlySpanChar, ReadOnlySpanChar) | Concatenates the string representations of two specified read-only character spans. |
| Concat(ReadOnlySpanChar, ReadOnlySpanChar, ReadOnlySpanChar) | Concatenates the string representations of three specified read-only character spans. |
| Concat(ReadOnlySpanChar, ReadOnlySpanChar, ReadOnlySpanChar, ReadOnlySpanChar) | Concatenates the string representations of four specified read-only character spans. |