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Null conditional operators for coalescing, assignment and member access #223

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Merged
merged 7 commits into from
Feb 19, 2020
Merged

Null conditional operators for coalescing, assignment and member access #223

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c4cb77d
Null conditional operators for coalescing, assignment and member access
adityapatwardhan Aug 26, 2019
8449c4b
Update 1-Draft/RFCNNN-Null-conditional-operators.md
adityapatwardhan Aug 27, 2019
6dfa2c3
Address feedback and move member access operators to additional consi…
adityapatwardhan Sep 27, 2019
e41f35b
Add operator precedence change
adityapatwardhan Oct 11, 2019
7a8f5f7
Fix typo in operator precedence example
adityapatwardhan Oct 15, 2019
c5eb257
Move null member access for specification section
adityapatwardhan Feb 7, 2020
177eaa2
Prepare RFC0051 (null conditional operators) for merging as Final
joeyaiello Feb 19, 2020
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13 changes: 13 additions & 0 deletions 1-Draft/RFCNNN-Null-conditional-operators.md
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Expand Up @@ -81,6 +81,19 @@ The `??` operator checks the left hand side to be null or undefined and returns

If the module `Pester` is not installed, then install the module.

### Updates to operator precedence

The operator precedence token flags will be updated to add gaps and place the null coalesce opeator at position 7, above comparison and below add/subtract.
Currently, the binary operator mask is set at `0x07`, which will be updated to `0x0f`.
This will ensure that `??` is evaluated before operators like `-eq`, `-and`, `-bor` etc, but after `+` and `-`.

This enables scenarios like:
```PowerShell
'x' -eq $null ?? 'x' evaluates to 'x' -eq ($null ?? 'x')

2 + $null ?? 3 evaluates to 2 + ($null ?? 3)
```

### Additional considerations

The `??=` and `??` operators are binary operators and check for the value of the left hand side to be null or an undefined variable.
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