move-js-function

move-js-function

function move(array, oldIndex, newIndex) {
    if (newIndex >= array.length) {
        newIndex = array.length - 1;
    }
    array.splice(newIndex, 0, array.splice(oldIndex, 1)[0]);
    return array;
}

describe('ArrayHelper', function() {
    it('Move right', function() {
        let array = [1, 2, 3];
        arrayHelper.move(array, 0, 1);
        assert.equal(array[0], 2);
        assert.equal(array[1], 1);
        assert.equal(array[2], 3);
    })
    it('Move left', function() {
        let array = [1, 2, 3];
        arrayHelper.move(array, 1, 0);
        assert.equal(array[0], 2);
        assert.equal(array[1], 1);
        assert.equal(array[2], 3);
    });
    it('Move out of bounds to the left', function() {
        let array = [1, 2, 3];
        arrayHelper.move(array, 1, -2);
        assert.equal(array[0], 2);
        assert.equal(array[1], 1);
        assert.equal(array[2], 3);
    });
    it('Move out of bounds to the right', function() {
        let array = [1, 2, 3];
        arrayHelper.move(array, 1, 4);
        assert.equal(array[0], 1);
        assert.equal(array[1], 3);
        assert.equal(array[2], 2);
    });
});