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## array-cheat-sheet.md

      
        
          
            
              
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                rauschma
                / array-cheat-sheet.md
            
            
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              August 24, 2025 00:29
            
          
        
      
        
  
      
    Cheat sheet: JavaScript Array methods

Deriving a new Array from an existing Array:
['■','●','▲'].slice(1, 3)          ⟼ ['●','▲']
['■','●','■'].filter(x => x==='■') ⟼ ['■','■']
    ['▲','●'].map(x => x+x)        ⟼ ['▲▲','●●']
    ['▲','●'].flatMap(x => [x,x])  ⟼ ['▲','▲','●','●']