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80 lines
1.8 KiB
JavaScript
80 lines
1.8 KiB
JavaScript
export default {
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init: function(arr, val) {
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var l = arr.length;
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while (l--) {
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arr[l] = val;
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}
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},
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/**
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* Shuffles the content of an array
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* @return {Array} the array itself shuffled
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*/
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shuffle: function(arr) {
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var i = arr.length - 1, j, x;
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for (i; i >= 0; i--) {
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j = Math.floor(Math.random() * i);
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x = arr[i];
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arr[i] = arr[j];
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arr[j] = x;
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}
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return arr;
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},
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toPointList: function(arr) {
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var i, j, row = [], rows = [];
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for ( i = 0; i < arr.length; i++) {
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row = [];
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for ( j = 0; j < arr[i].length; j++) {
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row[j] = arr[i][j];
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}
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rows[i] = "[" + row.join(",") + "]";
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}
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return "[" + rows.join(",\r\n") + "]";
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},
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/**
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* returns the elements which's score is bigger than the threshold
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* @return {Array} the reduced array
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*/
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threshold: function(arr, threshold, scoreFunc) {
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var i, queue = [];
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for ( i = 0; i < arr.length; i++) {
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if (scoreFunc.apply(arr, [arr[i]]) >= threshold) {
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queue.push(arr[i]);
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}
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}
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return queue;
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},
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maxIndex: function(arr) {
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var i, max = 0;
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for ( i = 0; i < arr.length; i++) {
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if (arr[i] > arr[max]) {
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max = i;
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}
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}
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return max;
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},
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max: function(arr) {
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var i, max = 0;
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for ( i = 0; i < arr.length; i++) {
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if (arr[i] > max) {
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max = arr[i];
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}
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}
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return max;
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},
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sum: function(arr) {
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var length = arr.length,
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sum = 0;
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while (length--) {
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sum += arr[length];
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}
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return sum;
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}
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};
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