JavaScript Best Practices: Types

Types

  • Primitives: When you access a primitive type you work directly on its value.
    • string
    • number
    • boolean
    • null
    • undefined
    var foo = 1;
    var bar = foo;
    
    bar = 9;
    
    console.log(foo, bar); // => 1, 9
    
  • Complex: When you access a complex type you work on a reference to its value.
    • object
    • array
    • function
    var foo = [1, 2];
    var bar = foo;
    
    bar[0] = 9;
    
    console.log(foo[0], bar[0]); // => 9, 9
    

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