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21 lines
583 B
JavaScript
21 lines
583 B
JavaScript
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//General helper functions
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//Returns the size (number of keys) of an object
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function sizeOfObject(obj) {
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var size = 0, key;
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for (key in obj) {
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if (obj.hasOwnProperty(key)) size++;
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}
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return size;
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}
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//Adds a random offset to a number within a certain percentage
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//e.g. addOffset(100, 5) will return anything from 95 to 105.
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//The percentage argument must be between 0 and 100;
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function addOffset(n, percentage) {
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if (percentage < 0 || percentage > 100) {return ;}
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var offset = n * (percentage / 100);
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return n * (Math.random() * (2 * offset) - offset);
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}
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