api-cheatsheet-array.md

Array<T>

Array<T>.prototype.*

• concat(: (T | Array<T>)[]): T[]
concat(items) 🔒
  • Returns a new array that is the concatenation of this and all items. Non-array parameters are treated as if they were arrays with single elements.
  • ES3
  • ['a'].concat('b', ['c', 'd']) → [ 'a', 'b', 'c', 'd' ]
• copyWithin(:number, :number, ?:number): this
copyWithin(target, start, end) ✏️
  • Copies the elements whose indices range from start to (excl.) end to indices starting with target. Overlapping is handled correctly.
  • ES6
  • ['a', 'b', 'c', 'd'].copyWithin(0, 2, 4) → [ 'c', 'd', 'c', 'd' ]
• entries(): Iterable<[number, T]>
entries() 🔒
  • Returns an iterable over [index, element] pairs.
  • ES6
  • Array.from(['a', 'b'].entries()) → [ [ 0, 'a' ], [ 1, 'b' ] ]
• every(:(value:T, index:number, array:Array<T>) => boolean, ?:any): boolean
every(callback, thisArg) 🔒
  • Returns true if callback returns true for every element. Stops as soon as it receives false. Math: ∀
  • ES5
  • [1, 2, 3].every(x => x > 0) → true
  • [1, -2, 3].every(x => x > 0) → false

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