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							|  |  |  | id: 5d792534cf81365cfca58794 | 
					
						
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										 |  |  | title: Part 34 | 
					
						
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										 |  |  | challengeType: 0 | 
					
						
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										 |  |  | dashedName: part-34 | 
					
						
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										 |  |  | --- | 
					
						
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										 |  |  | # --description--
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										 |  |  | 
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							|  |  |  | Apply `toNumberList(args)` to `spreadsheetFunctions[fn.toLowerCase()]`. | 
					
						
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										 |  |  | # --hints--
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										 |  |  | See description above for instructions. | 
					
						
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										 |  |  | ```js | 
					
						
							|  |  |  | assert( | 
					
						
							|  |  |  |   code | 
					
						
							|  |  |  |     .replace(/\s/g, '') | 
					
						
							|  |  |  |     .includes( | 
					
						
							|  |  |  |       'consttoNumberList=args=>args.split(",").map(parseFloat);constapplyFunction=(fn,args)=>spreadsheetFunctions[fn.toLowerCase()](toNumberList(args))' | 
					
						
							|  |  |  |     ) | 
					
						
							|  |  |  | ); | 
					
						
							|  |  |  | ``` | 
					
						
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										 |  |  | # --seed--
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										 |  |  | 
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										 |  |  | ## --before-user-code--
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										 |  |  | 
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										 |  |  | ```html | 
					
						
							|  |  |  | <!DOCTYPE html> | 
					
						
							|  |  |  | <html lang="en"> | 
					
						
							|  |  |  | <head> | 
					
						
							|  |  |  |   <meta charset="UTF-8"> | 
					
						
							|  |  |  |   <title>Spreadsheet</title> | 
					
						
							|  |  |  |   <style> | 
					
						
							|  |  |  |     #container { | 
					
						
							|  |  |  |       display: grid; | 
					
						
							|  |  |  |       grid-template-columns: 50px repeat(10, 200px); | 
					
						
							|  |  |  |       grid-template-rows: repeat(11, 30px); | 
					
						
							|  |  |  |     } | 
					
						
							|  |  |  |     .label { | 
					
						
							|  |  |  |       background-color: lightgray; | 
					
						
							|  |  |  |       text-align: center; | 
					
						
							|  |  |  |       vertical-align: middle; | 
					
						
							|  |  |  |       line-height: 30px; | 
					
						
							|  |  |  |     } | 
					
						
							|  |  |  |   </style> | 
					
						
							|  |  |  | </head> | 
					
						
							|  |  |  | <body> | 
					
						
							|  |  |  | <div id="container"> | 
					
						
							|  |  |  |   <div></div> | 
					
						
							|  |  |  | </div> | 
					
						
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										 |  |  | ``` | 
					
						
							|  |  |  | 
 | 
					
						
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										 |  |  | ## --after-user-code--
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										 |  |  | 
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										 |  |  | ```html | 
					
						
							|  |  |  | </body> | 
					
						
							|  |  |  | </html> | 
					
						
							|  |  |  | ``` | 
					
						
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										 |  |  | 
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										 |  |  | ## --seed-contents--
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										 |  |  | 
 | 
					
						
							|  |  |  | ```html | 
					
						
							|  |  |  | <script> | 
					
						
							|  |  |  | 
 | 
					
						
							|  |  |  | const infixToFunction = { | 
					
						
							|  |  |  |   "+": (x, y) => x + y, | 
					
						
							|  |  |  |   "-": (x, y) => x - y, | 
					
						
							|  |  |  |   "*": (x, y) => x * y, | 
					
						
							|  |  |  |   "/": (x, y) => x / y | 
					
						
							|  |  |  | }; | 
					
						
							|  |  |  | 
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							|  |  |  | const infixEval = (str, regex) => | 
					
						
							|  |  |  |   str.replace(regex, (_, arg1, fn, arg2) => | 
					
						
							|  |  |  |     infixToFunction[fn](parseFloat(arg1), parseFloat(arg2)) | 
					
						
							|  |  |  |   ); | 
					
						
							|  |  |  | 
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							|  |  |  | const highPrecedence = str => { | 
					
						
							|  |  |  |   const regex = /([0-9.]+)([*\/])([0-9.]+)/; | 
					
						
							|  |  |  |   const str2 = infixEval(str, regex); | 
					
						
							|  |  |  |   return str === str2 ? str : highPrecedence(str2); | 
					
						
							|  |  |  | }; | 
					
						
							|  |  |  | 
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							|  |  |  | const spreadsheetFunctions = { | 
					
						
							|  |  |  |   "": x => x | 
					
						
							|  |  |  | }; | 
					
						
							|  |  |  | 
 | 
					
						
							|  |  |  | const applyFn = str => { | 
					
						
							|  |  |  |   const noHigh = highPrecedence(str); | 
					
						
							|  |  |  |   const infix = /([0-9.]+)([+-])([0-9.]+)/; | 
					
						
							|  |  |  |   const str2 = infixEval(noHigh, infix); | 
					
						
							|  |  |  |   const regex = /([a-z]*)\(([0-9., ]*)\)(?!.*\()/i; | 
					
						
							|  |  |  |   const toNumberList = args => args.split(",").map(parseFloat); | 
					
						
							|  |  |  |   const applyFunction = (fn, args) => spreadsheetFunctions[fn.toLowerCase()]; | 
					
						
							|  |  |  | } | 
					
						
							|  |  |  | 
 | 
					
						
							|  |  |  | 
 | 
					
						
							|  |  |  | </script> | 
					
						
							|  |  |  | ``` | 
					
						
							|  |  |  | 
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										 |  |  | # --solutions--
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							|  |  |  | ```html | 
					
						
							|  |  |  | <script> | 
					
						
							|  |  |  | const infixToFunction = { | 
					
						
							|  |  |  |   "+": (x, y) => x + y, | 
					
						
							|  |  |  |   "-": (x, y) => x - y, | 
					
						
							|  |  |  |   "*": (x, y) => x * y, | 
					
						
							|  |  |  |   "/": (x, y) => x / y | 
					
						
							|  |  |  | }; | 
					
						
							|  |  |  | 
 | 
					
						
							|  |  |  | const infixEval = (str, regex) => | 
					
						
							|  |  |  |   str.replace(regex, (_, arg1, fn, arg2) => | 
					
						
							|  |  |  |     infixToFunction[fn](parseFloat(arg1), parseFloat(arg2)) | 
					
						
							|  |  |  |   ); | 
					
						
							|  |  |  | 
 | 
					
						
							|  |  |  | const highPrecedence = str => { | 
					
						
							|  |  |  |   const regex = /([0-9.]+)([*\/])([0-9.]+)/; | 
					
						
							|  |  |  |   const str2 = infixEval(str, regex); | 
					
						
							|  |  |  |   return str === str2 ? str : highPrecedence(str2); | 
					
						
							|  |  |  | }; | 
					
						
							|  |  |  | 
 | 
					
						
							|  |  |  | const spreadsheetFunctions = { | 
					
						
							|  |  |  |   "": x => x | 
					
						
							|  |  |  | }; | 
					
						
							|  |  |  | 
 | 
					
						
							|  |  |  | const applyFn = str => { | 
					
						
							|  |  |  |   const noHigh = highPrecedence(str); | 
					
						
							|  |  |  |   const infix = /([0-9.]+)([+-])([0-9.]+)/; | 
					
						
							|  |  |  |   const str2 = infixEval(noHigh, infix); | 
					
						
							|  |  |  |   const regex = /([a-z]*)\(([0-9., ]*)\)(?!.*\()/i; | 
					
						
							|  |  |  |   const toNumberList = args => args.split(",").map(parseFloat); | 
					
						
							|  |  |  |   const applyFunction = (fn, args) => | 
					
						
							|  |  |  |     spreadsheetFunctions[fn.toLowerCase()](toNumberList(args)); | 
					
						
							|  |  |  | } | 
					
						
							|  |  |  | </script> | 
					
						
							|  |  |  | ``` |