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Filename : array_helper.js
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export default {
    init: function(arr, val) {
        var l = arr.length;
        while (l--) {
            arr[l] = val;
        }
    },

    /**
     * Shuffles the content of an array
     * @return {Array} the array itself shuffled
     */
    shuffle: function(arr) {
        var i = arr.length - 1, j, x;
        for (i; i >= 0; i--) {
            j = Math.floor(Math.random() * i);
            x = arr[i];
            arr[i] = arr[j];
            arr[j] = x;
        }
        return arr;
    },

    toPointList: function(arr) {
        var i, j, row = [], rows = [];
        for ( i = 0; i < arr.length; i++) {
            row = [];
            for ( j = 0; j < arr[i].length; j++) {
                row[j] = arr[i][j];
            }
            rows[i] = "[" + row.join(",") + "]";
        }
        return "[" + rows.join(",\r\n") + "]";
    },

    /**
     * returns the elements which's score is bigger than the threshold
     * @return {Array} the reduced array
     */
    threshold: function(arr, threshold, scoreFunc) {
        var i, queue = [];
        for ( i = 0; i < arr.length; i++) {
            if (scoreFunc.apply(arr, [arr[i]]) >= threshold) {
                queue.push(arr[i]);
            }
        }
        return queue;
    },

    maxIndex: function(arr) {
        var i, max = 0;
        for ( i = 0; i < arr.length; i++) {
            if (arr[i] > arr[max]) {
                max = i;
            }
        }
        return max;
    },

    max: function(arr) {
        var i, max = 0;
        for ( i = 0; i < arr.length; i++) {
            if (arr[i] > max) {
                max = arr[i];
            }
        }
        return max;
    },

    sum: function(arr) {
        var length = arr.length,
            sum = 0;

        while (length--) {
            sum += arr[length];
        }
        return sum;
    }
};