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51 lines
1.2 KiB
51 lines
1.2 KiB
function mergeSort(arr) {
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if (arr.length < 2) {
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// Arrays of length 0 or 1 are sorted by definition.
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return arr;
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}
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const left = arr.slice(0, Math.floor(arr.length / 2));
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const right = arr.slice(Math.floor(arr.length / 2), Math.floor(arr.length));
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return merge(mergeSort(left), mergeSort(right));
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}
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function merge(arr1, arr2) {
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const merged = [];
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let i = 0,
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j = 0;
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while (i < arr1.length && j < arr2.length) {
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if (arr1[i] <= arr2[j]) {
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merged.push(arr1[i]);
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i++;
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} else if (arr2[j] < arr1[i]) {
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merged.push(arr2[j]);
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j++;
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}
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}
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merged.push(...arr1.slice(i), ...arr2.slice(j));
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return merged;
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}
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const deepEqual = require('./deepEqual');
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console.log(deepEqual(mergeSort([]), []));
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console.log(deepEqual(mergeSort([1]), [1]));
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console.log(deepEqual(mergeSort([2, 1]), [1, 2]));
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console.log(deepEqual(mergeSort([7, 2, 4, 3, 1, 2]), [1, 2, 2, 3, 4, 7]));
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console.log(deepEqual(mergeSort([1, 2, 3, 4, 5, 0]), [0, 1, 2, 3, 4, 5]));
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console.log(
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deepEqual(
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mergeSort([10, 9, 8, 7, 6, 5, 4, 3, 2, 1]),
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[1, 2, 3, 4, 5, 6, 7, 8, 9, 10],
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),
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);
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console.log(
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deepEqual(
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mergeSort([98322, 3242, 876, -234, 34, 12331]),
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[-234, 34, 876, 3242, 12331, 98322],
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),
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);
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