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| function Calculator() { | |
| this.methods = { | |
| '+': (a, b) => a + b, | |
| '-': (a, b) => a - b | |
| } | |
| this.calculate = function(str) { | |
| const split = str.split(' '); | |
| const op = split[1]; | |
| const a = +split[0]; | |
| const b = +split[2]; | |
| console.log('err', this.methods[op]); | |
| if(!this.methods[op] || isNaN(a) || isNaN(b)) { | |
| return NaN; | |
| } | |
| return this.methods[op](a, b); | |
| } | |
| this.addMethod = function(op, fn) { | |
| this.methods[op] = fn; | |
| } | |
| } | |
| let powerCalc = new Calculator; | |
| powerCalc.addMethod("*", (a, b) => a * b); | |
| powerCalc.addMethod("/", (a, b) => a / b); | |
| powerCalc.addMethod("**", (a, b) => a ** b); | |
| let result = powerCalc.calculate("2 ** 3"); | |
| console.log( result ); // 8 | |
| // class | |
| // class Calculator { | |
| // constructor() { | |
| // this.methods = { | |
| // 'x': (a, b) => a + b, | |
| // '-': (a, b) => a - b, | |
| // } | |
| // } | |
| // calculate(str) { | |
| // const arr = str.split(' '); | |
| // const op = arr[1]; | |
| // const a = arr[0]; | |
| // const b = arr[2]; | |
| // return this.methods[op](a, b); | |
| // } | |
| // addMethod(op, fn) { | |
| // this.methods[op] = fn; | |
| // } | |
| // } |
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