How to use fast-equals - 10 common examples
To help you get started, we’ve selected a few fast-equals examples, based on popular ways it is used in public projects.
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DestinyItemManager / DIM / src / app / storage / sync.service.ts View on Github 
async set(value: Partial, PUT = false): Promise {
if (!cached) {
throw new Error('Must call get at least once before setting');
}
if (!PUT && deepEqual(_.pick(cached, Object.keys(value)), value)) {
if ($featureFlags.debugSync) {
console.log(_.pick(cached, Object.keys(value)), value);
console.log('Skip save, already got it');
}
return;
}
// use replace to override the data. normally we're doing a PATCH
if (PUT) {
// update our data
cached = copy(value) as DimData;
} else {
Object.assign(cached, copy(value));
}
for (const adapter of adapters) {props,
state,
} = instance;
if (typeof actionCreators === 'function' && (!pure || !areOwnPropsEqual(props, nextProps))) {
instance.actionCreators = getActionCreators(actionCreators, __store.dispatch, nextProps);
}
if (!pure) {
return true;
}
return (
!areOwnPropsEqual(props, nextProps)
|| !areStatesEqual(state, nextState)
|| !shallowEqual(context, nextContext)
|| !areMergedPropsEqual(
// eslint workaround
mergeProps(state, wrappedActionCreators, props),
mergeProps(nextState, instance.actionCreators, nextProps)
)
);
};return isEven;
}),
DECREMENTING_ARRAY_RESULT,
),
},
object: {
false: isEqual(
mapObject(Object.assign({}, OBJECT), value => {
const isEven = value % 2 === 0;
return isEven;
}),
BAD_OBJECT_RESULT,
),
true: isEqual(
mapObject(Object.assign({}, OBJECT), value => {
const isEven = value % 2 === 0;
return isEven;
}),
OBJECT_RESULT,
),
},
standard: {
false: isEqual(
map([].concat(ARRAY), value => {
const isEven = value % 2 === 0;
return isEven;
}),
BAD_ARRAY_RESULT,object: {
false: isEqual(
reduceObject(OBJECT, (total, value) => (value % 2 === 0 ? total + value : total), 10),
BAD_OBJECT_RESULT,
),
true: isEqual(
reduceObject(OBJECT, (total, value) => (value % 2 === 0 ? total + value : total), 10),
OBJECT_RESULT,
),
},
standard: {
false: isEqual(
reduce(ARRAY, (total, value) => (value % 2 === 0 ? total + value : total), 10),
BAD_ARRAY_RESULT,
),
true: isEqual(
reduce(ARRAY, (total, value) => (value % 2 === 0 ? total + value : total), 10),
ARRAY_RESULT,
),
},
},
inlinedArrowReturn: {
decrementing: {
false: isEqual(
reduceRight(
ARRAY,
(total, value) => {
return value % 2 === 0 ? total + value : total;
},
10,
),
BAD_DECREMENTING_ARRAY_RESULT,),
true: isEqual(
reduceRight(ARRAY, function(total, value) {
return value % 2 === 0 ? total + value : total;
}),
DECREMENTING_ARRAY_RESULT,
),
},
object: {
false: isEqual(
reduceObject(OBJECT, function(total, value) {
return value % 2 === 0 ? total + value : total;
}),
BAD_OBJECT_RESULT,
),
true: isEqual(
reduceObject(OBJECT, function(total, value) {
return value % 2 === 0 ? total + value : total;
}),
OBJECT_RESULT,
),
},
standard: {
false: isEqual(
reduce(ARRAY, (total, value) => {
return value % 2 === 0 ? total + value : total;
}),
BAD_ARRAY_RESULT,
),
true: isEqual(
reduce(ARRAY, (total, value) => {
return value % 2 === 0 ? total + value : total;decrementing: {
false: isEqual(
reduceRight(ARRAY, (total, value) => (value % 2 === 0 ? total + value : total), 10),
BAD_DECREMENTING_ARRAY_RESULT,
),
true: isEqual(
reduceRight(ARRAY, (total, value) => (value % 2 === 0 ? total + value : total), 10),
DECREMENTING_ARRAY_RESULT,
),
},
object: {
false: isEqual(
reduceObject(OBJECT, (total, value) => (value % 2 === 0 ? total + value : total), 10),
BAD_OBJECT_RESULT,
),
true: isEqual(
reduceObject(OBJECT, (total, value) => (value % 2 === 0 ? total + value : total), 10),
OBJECT_RESULT,
),
},
standard: {
false: isEqual(
reduce(ARRAY, (total, value) => (value % 2 === 0 ? total + value : total), 10),
BAD_ARRAY_RESULT,
),
true: isEqual(
reduce(ARRAY, (total, value) => (value % 2 === 0 ? total + value : total), 10),
ARRAY_RESULT,
),
},
},
inlinedArrowReturn: {decrementing: {
false: isEqual(filterRight(ARRAY, isEven), BAD_DECREMENTING_ARRAY_RESULT),
true: isEqual(filterRight(ARRAY, isEven), DECREMENTING_ARRAY_RESULT),
},
object: {
false: isEqual(filterObject(OBJECT, isEven), BAD_OBJECT_RESULT),
true: isEqual(filterObject(OBJECT, isEven), OBJECT_RESULT),
},
standard: {
false: isEqual(filter(ARRAY, isEven), BAD_ARRAY_RESULT),
true: isEqual(filter(ARRAY, isEven), ARRAY_RESULT),
},
},
inlinedArrowExpression: {
decrementing: {
false: isEqual(filterRight(ARRAY, value => value % 2 === 0), BAD_DECREMENTING_ARRAY_RESULT),
true: isEqual(filterRight(ARRAY, value => value % 2 === 0), DECREMENTING_ARRAY_RESULT),
},
object: {
false: isEqual(filterObject(OBJECT, value => value % 2 === 0), BAD_OBJECT_RESULT),
true: isEqual(filterObject(OBJECT, value => value % 2 === 0), OBJECT_RESULT),
},
standard: {
false: isEqual(filter(ARRAY, value => value % 2 === 0), BAD_ARRAY_RESULT),
true: isEqual(filter(ARRAY, value => value % 2 === 0), ARRAY_RESULT),
},
},
inlinedArrowReturn: {
decrementing: {
false: isEqual(
filterRight(ARRAY, value => {
return value % 2 === 0;const ARRAY_RESULT = ARRAY.map(isEven);
const BAD_DECREMENTING_ARRAY_RESULT = [...BAD_ARRAY_RESULT].reverse();
const DECREMENTING_ARRAY_RESULT = [...ARRAY_RESULT].reverse();
const BAD_OBJECT_RESULT = Object.assign({}, OBJECT);
const OBJECT_RESULT = Object.keys(OBJECT).reduce((evenObject, key) => {
evenObject[key] = isEven(OBJECT[key]);
return evenObject;
}, {});
module.exports = {
cached: {
decrementing: {
false: isEqual(mapRight(ARRAY, isEven), BAD_DECREMENTING_ARRAY_RESULT),
true: isEqual(mapRight(ARRAY, isEven), DECREMENTING_ARRAY_RESULT),
},
object: {
false: isEqual(mapObject(OBJECT, isEven), BAD_OBJECT_RESULT),
true: isEqual(mapObject(OBJECT, isEven), OBJECT_RESULT),
},
standard: {
false: isEqual(map(ARRAY, isEven), BAD_ARRAY_RESULT),
true: isEqual(map(ARRAY, isEven), ARRAY_RESULT),
},
},
inlinedArrowExpression: {
decrementing: {
false: isEqual(mapRight(ARRAY, value => value % 2 === 0), BAD_DECREMENTING_ARRAY_RESULT),
true: isEqual(mapRight(ARRAY, value => value % 2 === 0), DECREMENTING_ARRAY_RESULT),
},object: {
false: isEqual(
reduceObject(OBJECT, (total, value) => {
return value % 2 === 0 ? total + value : total;
}),
BAD_OBJECT_RESULT,
),
true: isEqual(
reduceObject(OBJECT, (total, value) => {
return value % 2 === 0 ? total + value : total;
}),
OBJECT_RESULT,
),
},
standard: {
false: isEqual(
reduce(ARRAY, (total, value) => {
return value % 2 === 0 ? total + value : total;
}),
BAD_ARRAY_RESULT,
),
true: isEqual(
reduce(ARRAY, (total, value) => {
return value % 2 === 0 ? total + value : total;
}),
ARRAY_RESULT,
),
},
},
inlinedFunctionReturn: {
decrementing: {
false: isEqual('nan',
'nil',
'number',
'promise',
'string',
'symbol',
'undef',
'weakmap',
'weakset',
];
const newObject = copy(object);
console.log(object, newObject);
console.log('is equal object', sameValueZeroEqual(object, newObject));
console.log('is shallowEqual object', shallowEqual(object, newObject));
console.log('is deepEqual object', deepEqual(object, newObject));
console.log('lodash copy', _.cloneDeep(object));
console.log('clone copy', clone(object));
console.log('deepclone copy', deepClone(object));
Object.keys(object).forEach((key) => {
console.group(key);
console.log(`new object has key ${key}`, Object.prototype.hasOwnProperty.call(newObject, key));
if (~primitiveKeys.indexOf(key)) {
console.log(`is ${key} equal`, sameValueZeroEqual(object[key], newObject[key]));
} else {
console.log(`is ${key} not equal`, !sameValueZeroEqual(object[key], newObject[key]));
console.log(`is ${key} equivalent`, deepEqual(object[key], newObject[key]));fast-equals
A blazing fast equality comparison, either shallow or deep
