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test.js
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test.js
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const tap = require('tap');
const obrray = require('./index');
/**
* Array to object
*/
// Without options
tap.deepEqual(obrray.toObject([]), {});
tap.deepEqual(obrray.toObject([123]), { 0: 123 });
tap.deepEqual(obrray.toObject([11, 22, 33]), { 0: 11, 1: 22, 2: 33 });
tap.deepEqual(obrray.toObject([[11, 22], [33, 44], [55, 66]]), { 0: [11, 22], 1: [33, 44], 2: [55, 66] });
// Passing an object should return itself...
const obj = { test: 123 };
tap.equal(obrray.toObject(obj), obj);
// Using each array item both as key and value of the target object
tap.deepEqual(obrray.toObject([11, 22, 33], { sameKeyAndValue: true }), { 11: 11, 22: 22, 33: 33 });
const kvPairExpectedObject = {
name: 'Ford Prefect',
planet: 'Betelgeuse Seven',
nickname: 'lx'
};
// Standard key-value pairs array
tap.deepEqual(obrray.toObject(
[
['name', 'Ford Prefect'],
['planet', 'Betelgeuse Seven'],
['nickname', 'lx']
], { keyAndValuePairs: true }), kvPairExpectedObject);
// Inverted key-value pairs array
tap.deepEqual(obrray.toObject(
[
['Ford Prefect', 'name'],
['Betelgeuse Seven', 'planet'],
['lx', 'nickname']
], { invertedKeyAndValuePairs: true }), kvPairExpectedObject);
// Array with custom indexes for key and value
tap.deepEqual(obrray.toObject(
[
[147, false, 'Ford Prefect', [], 'name'],
[215, true, 'Betelgeuse Seven', [111], 'planet'],
[12, false, 'lx', [27, 1], 'nickname']
], { keyAndValuePairs: { keyIndex: 4, valueIndex: 2 } }), kvPairExpectedObject);
// Array of objects with key and value properties (with default names)
tap.deepEqual(obrray.toObject(
[
{ key: 'name', value: 'Ford Prefect' },
{ key: 'planet', value: 'Betelgeuse Seven' },
{ key: 'nickname', value: 'lx' }
], { keyAndValueObjects: true }), kvPairExpectedObject);
// Array of objects with key and value properties (with custom names)
tap.deepEqual(obrray.toObject(
[
{ k: 'name', v: 'Ford Prefect' },
{ k: 'planet', v: 'Betelgeuse Seven' },
{ k: 'nickname', v: 'lx' }
], { keyAndValueObjects: { keyProperty: 'k', valueProperty: 'v' } }), kvPairExpectedObject);
// Array of items with different structures (passing a mapping callback)
tap.deepEqual(obrray.toObject(
[
['name', 147, 27, 42, false, 15, 'Ford Prefect', false],
['planet', 'Betelgeuse Seven', [111]],
['nickname', 12, false, 'lx', [27, 1], 147, 98]
], { mapper: (item) => {
for (let i = 1; i < item.length; i++) {
if (typeof item[i] !== 'string') continue;
return { key: item[0], value: item[i] };
}
}
}), kvPairExpectedObject);
// Array of items with different structures (changing the target object from within the callback)
tap.deepEqual(obrray.toObject(
[
['name', 147, 27, 42, false, 15, 'Ford Prefect', false],
['planet', 'Betelgeuse Seven', [111]],
['nickname', 12, false, 'lx', [27, 1], 147, 98]
], { mapper: (item, targetObj) => {
for (let i = 1; i < item.length; i++) {
if (typeof item[i] !== 'string') continue;
targetObj[item[0]] = item[i];
}
}
}), kvPairExpectedObject);
// Using a no-op mapper
tap.deepEqual(obrray.toObject(
[
['name', 'Ford Prefect'],
['planet', 'Betelgeuse Seven'],
['nickname', 'lx']
], { mapper: () => {} }), {});
// Passing an invalid option returns the default output
tap.deepEqual(obrray.toObject([11, 22, 33], { someInvalidOption: true }), { 0: 11, 1: 22, 2: 33 });
/**
* Object to array
*/
// Without options
tap.deepEqual(obrray.toArray({}), []);
tap.deepEqual(obrray.toArray({ whatever: 123 }), [123]);
tap.deepEqual(obrray.toArray({ name: 'Vito', surname: 'Corleone' }), ['Vito', 'Corleone']);
tap.deepEqual(obrray.toArray({ 2: 'Corleone', 1: 'Andolini', 0: 'Vito' }), ['Vito', 'Andolini', 'Corleone']);
tap.deepEqual(obrray.toArray({ foo: 'bar', 2: 'Corleone', 1: 'Andolini', 0: 'Vito', bar: 'foo' }),
['Vito', 'Andolini', 'Corleone', 'bar', 'foo']);
// Passing an array should return itself...
const arr = [11, 22, 33];
tap.equal(obrray.toArray(arr), arr);
// Using property keys instead of values for each item
tap.deepEqual(obrray.toArray({ name: 'Vito', surname: 'Corleone' }, { useKeys: true }),
['name', 'surname']);
// Converting to an array of key and value pairs
tap.deepEqual(obrray.toArray(
{
name: 'Vito',
middleName: 'Andolini',
surname: 'Corleone'
}, { toKeyAndValuePairs: true }),
[['name', 'Vito'], ['middleName', 'Andolini'], ['surname', 'Corleone']]);
// Converting to an array of inverted key and value pairs
tap.deepEqual(obrray.toArray(
{
name: 'Vito',
middleName: 'Andolini',
surname: 'Corleone'
}, { toInvertedKeyAndValuePairs: true }),
[['Vito', 'name'], ['Andolini', 'middleName'], ['Corleone', 'surname']]);
// Converting to an array of key and value objects (with default property names)
tap.deepEqual(obrray.toArray(
{
name: 'Vito',
middleName: 'Andolini',
surname: 'Corleone'
}, { toKeyAndValueObjects: true }),
[{ key: 'name', value: 'Vito' }, { key: 'middleName', value: 'Andolini' }, { key: 'surname', value: 'Corleone' }]);
// Converting to an array of key and value objects (with custom property names)
tap.deepEqual(obrray.toArray(
{
name: 'Vito',
middleName: 'Andolini',
surname: 'Corleone'
}, { toKeyAndValueObjects: { keyProperty: 'k', valueProperty: 'v' } }),
[{ k: 'name', v: 'Vito' }, { k: 'middleName', v: 'Andolini' }, { k: 'surname', v: 'Corleone' }]);
// Using a sorter
tap.deepEqual(obrray.toArray(
{
name: 'Vito',
middleName: 'Andolini',
surname: 'Corleone'
}, { sorter: (a, b) => a.value.localeCompare(b.value) }),
['Andolini', 'Corleone', 'Vito']);
// Using a sorter along with other option
tap.deepEqual(obrray.toArray(
{
name: 'Vito',
middleName: 'Andolini',
surname: 'Corleone'
}, { sorter: (a, b) => a.value.localeCompare(b.value), toKeyAndValuePairs: true }),
[['middleName', 'Andolini'], ['surname', 'Corleone'], ['name', 'Vito']]);
// Using a custom mapper
tap.deepEqual(obrray.toArray(
{
name: 'Vito',
middleName: 'Andolini',
surname: 'Corleone'
}, { mapper: (item) => `The ${item.key} is "${item.value}"` }),
['The name is "Vito"', 'The middleName is "Andolini"', 'The surname is "Corleone"']);
// Using a custom mapper (changing the target array from within the callback)
tap.deepEqual(obrray.toArray(
{
name: 'Vito',
middleName: 'Andolini',
surname: 'Corleone'
},
{
mapper: (item, targetArr) => {
targetArr.push(`The ${item.key} is "${item.value}"`);
targetArr.push('...an additional item...');
}
}),
[
'The name is "Vito"',
'...an additional item...',
'The middleName is "Andolini"',
'...an additional item...',
'The surname is "Corleone"',
'...an additional item...'
]);
// Using a no-op mapper
tap.deepEqual(obrray.toArray(
{
name: 'Vito',
middleName: 'Andolini',
surname: 'Corleone'
}, { mapper: () => {} }), []);
// Passing an invalid option returns the default output
tap.deepEqual(obrray.toArray({
name: 'Vito',
middleName: 'Andolini',
surname: 'Corleone'
}, { someInvalidOption: true }), ['Vito', 'Andolini', 'Corleone']);
/**
* Errors
*/
const toObjectMappingOptions = [
'keyAndValuePairs',
'invertedKeyAndValuePairs',
'keyAndValueObjects',
'mapper'];
const toArrayMappingOptions = [
'useKeys',
'toKeyAndValuePairs',
'toInvertedKeyAndValuePairs',
'toKeyAndValueObjects',
'mapper'];
// Accepted types checking
[true, 15, 'whatever', undefined, null].forEach((testValue) => {
tap.throws(() => obrray.toArray(testValue),
new Error('The first argument supplied for toArray() method is invalid. Only objects are accepted.'));
tap.throws(() => obrray.toObject(testValue),
new Error('The first argument supplied for toObject() method is invalid. Only arrays are accepted.'));
});
// Only one mapping option at once checking
getPairs(toObjectMappingOptions).forEach((optionsPair) => {
tap.throws(() => obrray.toObject([], { [optionsPair[0]]: true, [optionsPair[1]]: true }),
new Error('Only one mapping option can be passed at a time.'));
});
getPairs(toArrayMappingOptions).forEach((optionsPair) => {
tap.throws(() => obrray.toArray({}, { [optionsPair[0]]: true, [optionsPair[1]]: true }),
new Error('Only one mapping option can be passed at a time.'));
});
// Invalid key checking
[true, {}, [], undefined, null].forEach((testValue) => {
tap.throws(() => obrray.toObject([testValue], { sameKeyAndValue: true }),
new Error('The array supplied has an invalid key (only number and string are allowed).'));
});
// Duplicate keys checking
tap.throws(() => obrray.toObject([11, 11, 22], { sameKeyAndValue: true }),
new Error('The array supplied has duplicate keys.'));
// Valid key-value array checking
tap.throws(() => obrray.toObject([[1, 11], [2], [3, 33]], { keyAndValuePairs: true }),
new Error('Invalid array supplied. Expected an array of key-value pairs.'));
tap.throws(() => obrray.toObject([[1, 11]], { keyAndValuePairs: { valueIndex: 10 } }),
new Error('Invalid array supplied. Expected an array of key-value pairs.'));
function getPairs(arr) {
const pairs = [];
for (let i = 0; i < arr.length; i++) {
for (let j = i + 1; j < arr.length; j++) {
pairs.push([arr[i], arr[j]]);
}
}
return pairs;
}