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triangle.js
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triangle.js
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function triangleType(sideA, sideB, sideC) {
"use strict";
if (arguments.length !== 3) {
throw "there needs to be exactly 3 arguments";
}
if (typeof sideA !== "number" || typeof sideB !== "number" || typeof sideC !== "number") {
throw "all arguments have to be numbers";
}
if (sideA <= 0 || sideB <= 0 || sideC <= 0) {
throw "all arguments have to be positive";
}
if (sideA + sideB <= sideC || sideB + sideC <= sideA || sideA + sideC <= sideB) {
throw "it's only a valid triangle if any two side's sum are greater than the third side";
}
if (sideA === sideB && sideB === sideC) {
return "equilateral";
} else if (sideA === sideB || sideB === sideC || sideC === sideA) {
return "isosceles";
} else {
return "scalene";
}
}
module.exports = triangleType;