Added functions and ensured the context was being passed around correctly

app/imports/parser/functions.js

@@ -0,0 +1,83 @@
+export default {
+  'abs': {
+    comment: 'Returns the absolute value of a number',
+    examples: [
+      {input: 'abs(9)', result: '9'},
+      {input: 'abs(-3)', result: '3'},
+    ],
+    argumentType: 'number',
+    resultType: 'number',
+    fn: Math.abs,
+  },
+  'sqrt': {
+    comment: 'Returns the square root of a number',
+    examples: [
+      {input: 'sqrt(16)', result: '4'},
+      {input: 'sqrt(10)', result: '3.1622776601683795'},
+    ],
+    argumentType: 'number',
+    resultType: 'number',
+    fn: Math.sqrt,
+  },
+  'max': {
+    comment: 'Returns the largest of the given numbers',
+    examples: [{input: 'min(12, 6, 3, 168)', result: '168'}],
+    argumentType: 'number',
+    resultType: 'number',
+    fn: Math.max,
+  },
+  'min': {
+    comment: 'Returns the smallest of the given numbers',
+    examples: [{input: 'min(12, 6, 3, 168)', result: '3'}],
+    argumentType: 'number',
+    resultType: 'number',
+    fn: Math.min,
+  },
+  'round': {
+    comment: 'Returns the value of a number rounded to the nearest integer',
+    examples: [
+      {input: 'round(5.95)', result: '6'},
+      {input: 'round(5.5)', result: '6'},
+      {input: 'round(5.05)', result: '5'},
+    ],
+    argumentType: 'number',
+    resultType: 'number',
+    fn: Math.round,
+  },
+  'floor': {
+    comment: 'Rounds a number down to the next smallest integer',
+    examples: [
+      {input: 'floor(5.95)', result: '5'},
+      {input: 'floor(5.05)', result: '5'},
+      {input: 'floor(5)', result: '5'},
+      {input: 'floor(-5.5)', result: '-6'},
+    ],
+    argumentType: 'number',
+    resultType: 'number',
+    fn: Math.floor,
+  },
+  'ceil': {
+    comment: 'Rounds a number up to the next largest integer',
+    examples: [
+      {input: 'ceil(5.95)', result: '6'},
+      {input: 'ceil(5.05)', result: '6'},
+      {input: 'ceil(5)', result: '5'},
+      {input: 'ceil(-5.5)', result: '-5'},
+    ],
+    argumentType: 'number',
+    resultType: 'number',
+    fn: Math.ceil,
+  },
+  'trunc': {
+    comment: 'Returns the integer part of a number by removing any fractional digits',
+    examples: [
+      {input: 'trunc(5.95)', result: '5'},
+      {input: 'trunc(5.05)', result: '5'},
+      {input: 'trunc(5)', result: '5'},
+      {input: 'trunc(-5.5)', result: '-5'},
+    ],
+    argumentType: 'number',
+    resultType: 'number',
+    fn: Math.trunc,
+  },
+}