-
Notifications
You must be signed in to change notification settings - Fork 0
Commit
This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository.
Merge pull request #3 from amrendrakind/events
Math Magicians: Events
- Loading branch information
Showing
7 changed files
with
237 additions
and
17 deletions.
There are no files selected for viewing
Some generated files are not rendered by default. Learn more about how customized files appear on GitHub.
Oops, something went wrong.
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,133 @@ | ||
| import operate from './Operate'; | ||
|
|
||
| function isNumber(item) { | ||
| return !!item.match(/[0-9]+/); | ||
| } | ||
|
|
||
| /** | ||
| * Given a button name and a calculator data object, return an updated | ||
| * calculator data object. | ||
| * | ||
| * Calculator data object contains: | ||
| * total:s the running total | ||
| * next:String the next number to be operated on with the total | ||
| * operation:String +, -, etc. | ||
| */ | ||
| export default function calculate(obj, buttonName) { | ||
| if (buttonName === 'AC') { | ||
| return { | ||
| total: null, | ||
| next: '0', | ||
| operation: null, | ||
| }; | ||
| } | ||
|
|
||
| if (isNumber(buttonName)) { | ||
| if (buttonName === '0' && obj.next === '0') { | ||
| return {}; | ||
| } | ||
| // If there is an operation, update next | ||
| if (obj.operation) { | ||
| if (obj.next && obj.next !== '0') { | ||
| return { ...obj, next: obj.next + buttonName }; | ||
| } | ||
| return { ...obj, next: buttonName }; | ||
| } | ||
| // If there is no operation, update next and clear the value | ||
| if (obj.next && obj.next !== '0') { | ||
| return { | ||
| next: obj.next + buttonName, | ||
| total: null, | ||
| }; | ||
| } | ||
| return { | ||
| next: buttonName, | ||
| total: null, | ||
| }; | ||
| } | ||
|
|
||
| if (buttonName === '.') { | ||
| if (obj.next) { | ||
| if (obj.next.includes('.')) { | ||
| return { ...obj }; | ||
| } | ||
| return { ...obj, next: `${obj.next}.` }; | ||
| } | ||
| if (obj.operation) { | ||
| return { ...obj, next: '0.' }; | ||
| } | ||
| if (obj.total) { | ||
| if (obj.total.includes('.')) { | ||
| return {}; | ||
| } | ||
| return { ...obj, next: `${obj.total}.` }; | ||
| } | ||
| return { ...obj, next: '0.' }; | ||
| } | ||
|
|
||
| if (buttonName === '=') { | ||
| if (obj.next && obj.operation) { | ||
| return { | ||
| total: operate(obj.total, obj.next, obj.operation), | ||
| next: null, | ||
| operation: null, | ||
| }; | ||
| } | ||
| // '=' with no operation, nothing to do | ||
| return {}; | ||
| } | ||
|
|
||
| if (buttonName === '+/-') { | ||
| if (obj.next) { | ||
| return { ...obj, next: (-1 * parseFloat(obj.next)).toString() }; | ||
| } | ||
| if (obj.total) { | ||
| return { ...obj, total: (-1 * parseFloat(obj.total)).toString() }; | ||
| } | ||
| return {}; | ||
| } | ||
|
|
||
| // Button must be an operation | ||
|
|
||
| // When the user presses an operation button without having entered | ||
| // a number first, do nothing. | ||
| // if (!obj.next && !obj.total) { | ||
| // return {}; | ||
| // } | ||
|
|
||
| // User pressed an operation after pressing '=' | ||
| if (!obj.next && obj.total && !obj.operation) { | ||
| return { ...obj, operation: buttonName }; | ||
| } | ||
|
|
||
| // User pressed an operation button and there is an existing operation | ||
| if (obj.operation) { | ||
| if (obj.total && !obj.next) { | ||
| return { ...obj, operation: buttonName }; | ||
| } | ||
|
|
||
| if (!obj.total) { | ||
| return { total: 0, operation: buttonName }; | ||
| } | ||
|
|
||
| return { | ||
| total: operate(obj.total, obj.next, obj.operation), | ||
| next: null, | ||
| operation: buttonName, | ||
| }; | ||
| } | ||
|
|
||
| // no operation yet, but the user typed one | ||
|
|
||
| // The user hasn't typed a number yet, just save the operation | ||
| if (!obj.next) { | ||
| return { operation: buttonName }; | ||
| } | ||
|
|
||
| // save the operation and shift 'next' into 'total' | ||
| return { | ||
| total: obj.next, | ||
| next: null, | ||
| operation: buttonName, | ||
| }; | ||
| } |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,30 @@ | ||
| import Big from 'big.js'; | ||
|
|
||
| export default function operate(numberOne, numberTwo, operation) { | ||
| const one = Big(numberOne); | ||
| const two = Big(numberTwo); | ||
| if (operation === '+') { | ||
| return one.plus(two).toString(); | ||
| } | ||
| if (operation === '-') { | ||
| return one.minus(two).toString(); | ||
| } | ||
| if (operation === 'x') { | ||
| return one.times(two).toString(); | ||
| } | ||
| if (operation === '÷') { | ||
| try { | ||
| return one.div(two).toString(); | ||
| } catch (err) { | ||
| return "Can't divide by 0."; | ||
| } | ||
| } | ||
| if (operation === '%') { | ||
| try { | ||
| return one.mod(two).toString(); | ||
| } catch (err) { | ||
| return "Can't find modulo as can't divide by 0."; | ||
| } | ||
| } | ||
| throw Error(`Unknown operation '${operation}'`); | ||
| } |