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August 13, 2018 18:39
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Compare various merge modules (no timed benchmarks just functional differences)
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// npm i deepmerge object-merge merge underscore --no-save | |
const mergers = { | |
deepmerge: require('deepmerge'), | |
'deepmerge.all': (...args) => require('deepmerge').all(args), | |
'object-merge': require('object-merge'), | |
'Object.assign': Object.assign, | |
merge: require('merge'), | |
'merge (recursive)': require('merge').recursive, | |
spread: (...args) => ({ ...args[0], ...args[1], ...args[2] }), | |
'underscore (extend)': require('underscore').extend, | |
'underscore (extendOwn)': require('underscore').extendOwn, | |
}; | |
function test(merge) { | |
const first = { | |
firstNull: null, | |
destNull: 'not null', | |
firstUndefined: undefined, | |
destUndefined: 'not undefined', | |
boolean: true, | |
array: [1, 2, 3, null, undefined], | |
thrice: 'first', | |
nestedObj: { | |
bananas: 1, | |
oranges: 1, | |
referenceTest: 'first', | |
}, | |
}; | |
const second = { | |
firstNull: 'not null', | |
destNull: null, | |
firstUndefined: 'not undefined', | |
destUndefined: undefined, | |
boolean: false, | |
array: [5, 6, 7], | |
thrice: 'second', | |
nestedObj: { | |
apples: 1, | |
oranges: 2, | |
referenceTest: 'second', | |
}, | |
}; | |
const third = { | |
thrice: 'third', | |
fromThird: true, | |
}; | |
const merged = merge(first, second, third); | |
first.nestedObj.referenceTest = 'changed first'; | |
second.nestedObj.referenceTest = 'changed second'; | |
console.log(merged); | |
} | |
console.log('Results'); | |
Object.keys(mergers).forEach((name) => { | |
console.log(); | |
console.log(`Testing: ${name}`); | |
test(mergers[name]); | |
}); |
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Results | |
Testing: deepmerge | |
{ firstNull: 'not null', | |
destNull: null, | |
firstUndefined: 'not undefined', | |
destUndefined: undefined, | |
boolean: false, | |
array: [ 1, 2, 3, null, undefined, 5, 6, 7 ], | |
thrice: 'second', | |
nestedObj: | |
{ bananas: 1, oranges: 2, referenceTest: 'second', apples: 1 } } | |
Testing: deepmerge.all | |
{ firstNull: 'not null', | |
destNull: null, | |
firstUndefined: 'not undefined', | |
destUndefined: undefined, | |
boolean: false, | |
array: [ 1, 2, 3, null, undefined, 5, 6, 7 ], | |
thrice: 'third', | |
nestedObj: | |
{ bananas: 1, oranges: 2, referenceTest: 'second', apples: 1 }, | |
fromThird: true } | |
Testing: object-merge | |
{ firstNull: 'not null', | |
destNull: null, | |
firstUndefined: 'not undefined', | |
destUndefined: undefined, | |
boolean: false, | |
array: [ 5, 6, 7, null, undefined ], | |
thrice: 'third', | |
nestedObj: | |
{ bananas: 1, oranges: 2, referenceTest: 'second', apples: 1 }, | |
fromThird: true } | |
Testing: Object.assign | |
{ firstNull: 'not null', | |
destNull: null, | |
firstUndefined: 'not undefined', | |
destUndefined: undefined, | |
boolean: false, | |
array: [ 5, 6, 7 ], | |
thrice: 'third', | |
nestedObj: { apples: 1, oranges: 2, referenceTest: 'changed second' }, | |
fromThird: true } | |
Testing: merge | |
{ firstNull: 'not null', | |
destNull: null, | |
firstUndefined: 'not undefined', | |
destUndefined: undefined, | |
boolean: false, | |
array: [ 5, 6, 7 ], | |
thrice: 'third', | |
nestedObj: { apples: 1, oranges: 2, referenceTest: 'changed second' }, | |
fromThird: true } | |
Testing: merge (recursive) | |
{ firstNull: 'not null', | |
destNull: null, | |
firstUndefined: 'not undefined', | |
destUndefined: undefined, | |
boolean: false, | |
array: [ 5, 6, 7 ], | |
thrice: 'third', | |
nestedObj: | |
{ bananas: 1, | |
oranges: 2, | |
referenceTest: 'changed first', | |
apples: 1 }, | |
fromThird: true } | |
Testing: spread | |
{ firstNull: 'not null', | |
destNull: null, | |
firstUndefined: 'not undefined', | |
destUndefined: undefined, | |
boolean: false, | |
array: [ 5, 6, 7 ], | |
thrice: 'third', | |
nestedObj: { apples: 1, oranges: 2, referenceTest: 'changed second' }, | |
fromThird: true } | |
Testing: underscore (extend) | |
{ firstNull: 'not null', | |
destNull: null, | |
firstUndefined: 'not undefined', | |
destUndefined: undefined, | |
boolean: false, | |
array: [ 5, 6, 7 ], | |
thrice: 'third', | |
nestedObj: { apples: 1, oranges: 2, referenceTest: 'changed second' }, | |
fromThird: true } | |
Testing: underscore (extendOwn) | |
{ firstNull: 'not null', | |
destNull: null, | |
firstUndefined: 'not undefined', | |
destUndefined: undefined, | |
boolean: false, | |
array: [ 5, 6, 7 ], | |
thrice: 'third', | |
nestedObj: { apples: 1, oranges: 2, referenceTest: 'changed second' }, | |
fromThird: true } |
Updated with JavaScript native spread
Updated with test using underscore. The results are disappointing as bananas
is missing from spread and underscore
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deepmerge.all()
andobject-merge
treat arrays with different behaviour but otherwise with identical structure