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Set.prototype.difference() - JavaScript | MDN
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Set.prototype.difference()

Baseline 2024
Newly available

Since 2024 6, this feature works across the latest devices and browser versions. This feature might not work in older devices or browsers.

Set difference() .

In this article

js
difference(other)

other

Set

other Set .

(difference) .

AB={xAxB}A\setminus B = {x\in A\mid x\notin B}

. A B A B . [ . A B A B .]

difference() other . this Set this . this other .

  • this other.size other.size keys() other other .
  • , this other.has(e) e .

this .

difference()

(<10) (<10) . .

js
const odds = new Set([1, 3, 5, 7, 9]);
const squares = new Set([1, 4, 9]);
console.log(odds.difference(squares)); // Set(3) { 3, 5, 7 }

Specification
ECMAScript 2027 LanguageSpecification
# sec-set.prototype.difference

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  2. Set
    1. Set()
    1. Set[Symbol.species]
    1. Set.prototype.add()
    2. Set.prototype.clear()
    3. Set.prototype.delete()
    4. Set.prototype.difference()
    5. Set.prototype.entries()
    6. Set.prototype.forEach()
    7. Set.prototype.has()
    8. Set.prototype.intersection()
    9. Set.prototype.isDisjointFrom()
    10. Set.prototype.isSubsetOf()
    11. Set.prototype.isSupersetOf()
    12. Set.prototype.keys()
    13. Set.prototype.symmetricDifference()
    14. Set.prototype.union()
    15. Set.prototype.values()
    16. Set.prototype[@@iterator]()
    1. Set.prototype.size
  8. Object/Function
    1. Function.prototype.apply()
    2. Function.prototype.bind()
    3. Function.prototype.call()
    4. Function.prototype.toSource()
    5. Function.prototype[@@hasInstance]()
    1. Function: displayName
    2. Function.prototype.length
    3. Function: name
    4. Function
    5. Function.arguments
    6. Function.prototype.caller
    1. Object.prototype.__defineGetter__()
    2. Object.prototype.__defineSetter__()
    3. Object.prototype.__lookupGetter__()
    4. Object.prototype.__lookupSetter__()
    5. Object.prototype.hasOwnProperty()
    6. Object.prototype.isPrototypeOf()
    7. Object.prototype.propertyIsEnumerable()
    8. Object.prototype.toLocaleString()
    9. Object.prototype.toString()
    10. Object.prototype.valueOf()
    1. Object.prototype.__proto__
    2. Object.prototype.constructor
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