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class MathHelper { static PI = 3.14159; static count = 0; constructor(value) { this.value = value; MathHelper.count++; } static add(a, b) { return a + b; } static multiply(a, b) { return a * b; } static circleArea(r) { return MathHelper.PI * r * r; } } console.log(MathHelper.add(2, 3)); // 5 console.log(MathHelper.multiply(4, 5)); // 20 console.log(MathHelper.circleArea(5)); // 78.53975 new MathHelper(10); new MathHelper(20); console.log(MathHelper.count); // 2 // console.log(new MathHelper(1).add(2,3)); // TypeError
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