Created
March 14, 2017 10:53
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Calculator Library
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function Calculator(num){ | |
return { | |
answer : num ? num : 0, | |
equals : function() { | |
return this.answer | |
}, | |
add : function(num) { | |
this.answer += num ? num : 1 | |
return this | |
}, | |
subtract : function(num) { | |
this.answer -= num ? num : 1 | |
return this | |
}, | |
multiply : function(num) { | |
this.answer *= num ? num : 1 | |
return this | |
}, | |
divide : function(num) { | |
this.answer /= num ? num : 1 | |
return this | |
}, | |
modulo : function(num) { | |
this.answer %= num ? num : 1 | |
return this | |
}, | |
invert : function(num) { | |
this.answer = this.answer * -1 | |
return this | |
}, | |
clear : function() { | |
this.answer = 0 | |
return this | |
} | |
} | |
} | |
var calc = new Calculator() | |
console.log("Calculator adds 5 multiplies by 4 and divides by 2") | |
calc.add(5).multiply(4).divide(2) | |
console.log("Calculator = " + calc.equals()) | |
console.log("Calculator adds one to the answer") | |
calc.add() | |
console.log("Calculator = " + calc.equals()) | |
console.log("Calculator inverts the answer") | |
calc.invert() | |
console.log("Calculator = " + calc.equals()) | |
console.log("Calculator resets") | |
calc.clear() | |
console.log("Calculator = " + calc.equals()) | |
console.log("new calculator starts at 10 and finds the remainder after dividing by 3") | |
var calculator = new Calculator(10).modulo(3) | |
console.log("Calculator = " + calculator.equals()) |
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