ryasmi
/ triangular.js
Last active
February 18, 2019 12:46
The function triangular returns the triangular number of the inputted value. For example triangular(3) would return 6 because 1 + 2 + 3 is equal to 6. This function accounts for both negative values and zero.
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| var triangular = function (value) { | |
| var abs = Math.abs(value); | |
| return ((abs / 2) * (abs + 1)) * (abs / value) || 0; | |
| }; | |
| // Testing code. | |
| var testTriangular = function () { | |
| var testTriangularValue = function (arg, value, id) { | |
| console.log(triangular(arg) === value ? "Test " + id + " passed." : "Test " + id + " failed."); | |
| }; |