Operators

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General

Info:

• put spaces around operators

Arithmetic

• Operator Precedence
  • * and / have higher precedence than + and -.
  • parentheses are computed first ()
  • same precedence is computed from left to right

Assignment

bla

Concatenation

Info:

• + and += can be used for adding Strings

  let text1 = "What a very ";
  text1 += "nice day";

Danger:

• Numbers + String will result a String

  let y = "5" + 5; // String!
  let z = "Hello" + 5; // Hello5

  let x = 16 + 4 + "Volvo"; //20Volvo

  let x = "Volvo" + 16 + 4; // Volvo164

Comparison

bla

String

bla

Logical

bla

Comparison

Bitwise

Ternary

bla

Type

• typeof

  • returns the type of a variable or an expression

    typeof ""             // Returns "string"
    typeof "John"         // Returns "string"
    typeof "John Doe"     // Returns "string"

    typeof 0              // Returns "number"
    typeof 314            // Returns "number"
    typeof 3.14           // Returns "number"
    typeof (3)            // Returns "number"
    typeof (3 + 4)        // Returns "number"

    let car;    // Value is undefined, type is undefined