@astronautlabs/jsonpath/dist.esm/src/slice.test.js

Query JavaScript objects with JSONPath expressions. Robust / safe JSONPath engine for Node.js.

import * as assert from 'assert';
import { suite } from 'razmin';
import { slice } from './slice';
var data = ['a', 'b', 'c', 'd', 'e', 'f'];
suite(function (describe) {
    describe('slice', function (it) {
        it('no params yields copy', function () {
            assert.deepEqual(slice(data), data);
        });
        it('no end param defaults to end', function () {
            assert.deepEqual(slice(data, 2), data.slice(2));
        });
        it('zero end param yields empty', function () {
            assert.deepEqual(slice(data, 0, 0), []);
        });
        it('first element with explicit params', function () {
            assert.deepEqual(slice(data, 0, 1, 1), ['a']);
        });
        it('last element with explicit params', function () {
            assert.deepEqual(slice(data, -1, 6), ['f']);
        });
        it('empty extents and negative step reverses', function () {
            assert.deepEqual(slice(data, null, null, -1), ['f', 'e', 'd', 'c', 'b', 'a']);
        });
        it('negative step partial slice', function () {
            assert.deepEqual(slice(data, 4, 2, -1), ['e', 'd']);
        });
        it('negative step partial slice no start defaults to end', function () {
            assert.deepEqual(slice(data, null, 2, -1), ['f', 'e', 'd']);
        });
        it('extents clamped end', function () {
            assert.deepEqual(slice(data, null, 100), data);
        });
        it('extents clamped beginning', function () {
            assert.deepEqual(slice(data, -100, 100), data);
        });
        it('backwards extents yields empty', function () {
            assert.deepEqual(slice(data, 2, 1), []);
        });
        it('zero step gets shot down', function () {
            assert.throws(function () { slice(data, null, null, 0); });
        });
    });
});
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