Merge pull request #135 from PopWarner/master

Column sample for tolerance comparison using abs() operator

column-samples/number-abs-tolerance-comparison/number-abs-tolerance-comparison.json

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+{
+    "$schema": "https://developer.microsoft.com/json-schemas/sp/column-formatting.schema.json",
+    "elmType": "div",
+    "children": [
+      {
+        "elmType": "span",
+        "attributes": {
+          "class": "=if(abs([$Actual]-[$Expected])<=[$Tolerance], 'sp-field-trending--up','sp-field-trending--down')",
+          "iconName": "=if(abs([$Actual]-[$Expected])<=[$Tolerance], 'LikeSolid','DislikeSolid')"
+        }
+      },
+      {
+        "elmType": "span",
+        "txtContent": "[$After]"
+      },
+      {
+        "elmType": "span",
+        "txtContent": "=if(abs([$Actual]-[$Expected])<=[$Tolerance], 'Pass','Fail')",
+        "attributes": {
+          "class": "=if(abs([$Actual]-[$Expected])<=[$Tolerance], 'sp-field-trending--up','sp-field-trending--down')"
+        },
+        "style": {
+          "padding-left": "5px"
+        }
+      }
+    ]
+  }

column-samples/number-abs-tolerance-comparison/readME.md

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+# Determine Tolerance Comparison using abs()
+
+## Summary
+
+Display if a value is within the expected tolerance.
+
+To determine success, the column formatting definition subtracts the "Actual" value from the "Expected" value and applies the "abs()" operator to retrieve the absolute value. The result is compared to the "Tolerance" column value to determine pass or fail.
+
+An Office UI Fabric class and icon is also applied to provide visual indicators of Pass or Fail.
+
+
+### Screenshot
+![screenshot of the sample](./screenshot.jpg)
+
+
+## Column Types
+The columns used in this sample were created as "Number" column types.
+
+## View requirements
+- N/A
+
+## Sample
+
+Solution|Author(s)
+--------|---------
+number-abs-tolerance-comparison.json | [David Warner II](https://twitter.com/davidwarnerii) / [Warner.Digital](http://warner.digital)
+
+## Version history
+
+Version|Date|Comments
+-------|----|--------
+1.0|March 8, 2019|Initial release
+
+## Disclaimer
+**THIS CODE IS PROVIDED *AS IS* WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESS OR IMPLIED, INCLUDING ANY IMPLIED WARRANTIES OF FITNESS FOR A PARTICULAR PURPOSE, MERCHANTABILITY, OR NON-INFRINGEMENT.**
+
+---
+
+## Additional notes
+
+- [Use column formatting to customize SharePoint](https://docs.microsoft.com/en-us/sharepoint/dev/declarative-customization/column-formatting)
+
+
+<img src="https://telemetry.sharepointpnp.com/sp-dev-list-formatting/column-samples/number-abs-tolerance-comparison" />