Conditional Operators

  • JavaScript’s conditional operator can be used as a shorthand for conditional statements(these are covered in a later lesson).
  • The conditional operator assigns a value to a variable according to the result of a specified condition (a real world example: if the weather is cold outside, you choose to wear a coat. If it isn’t you don’t. Checking the weather is the condition).
  • The conditional operator has a specified syntax(way of writing/coding) instead of a single operator.

    1. Conditional : used to test the relationship between a variable’s value and another variable’s value, using the comparison operators

  • Syntax: variablename = (condition) ? value1:value2

  • Examples:

    let time = 1800; //this is 6pm in military time
    let currentSky = time >= 1650 ? "dark" : "light";
    
  • The currentSky variable will evaluate to “dark” if the condition is true, or “light” if the condition is false.

  • Q : What is the result of the comparison (light or dark)?

  • In this example:

    time = 700; //this is 7am military time
    currentSky = time <= 1650 ? "light" : "dark";
    
  • What is the result of the comparison (light or dark)?

    Logical Operators

  • JavaScript’s logical operators are used to determine whether an entire statement/condition is true or false depending on the operation and values involved.

  • These can be used to assign boolean values to variables or to determine the next course of action in conditional statements.

  • The logical operators have symbols known as the operators that are used to perform the operations

    1. And : if the values on both sides of the operand are true, then the operation returns true. If one is false, the operation returns false. If both are false, the operation returns false.

  • Operator: &&

  • Examples:

    x = 20;
    y = 30;
    j = 19;
    z = x > 10 && y < 50; //returns true
    
Conditional Operators JavaScript’s conditional operator can be used as a shorthand for conditional statements(these are covered in a later lesson). The conditional operator assigns a value to a variable according to the result of a specified condition (a real world example: if the weather is cold outside, you choose to wear a coat. If it isn’t you don’t. Checking the weather is the condition). The conditional operator has a specified syntax(way of writing/coding) instead of a single operator. 1. Conditional : used to test the relationship between a variable’s value and another variable’s value, using the comparison operators Syntax: variablename = (condition) ? value1:value2 Examples: let time = 1800; //this is 6pm in military time let currentSky = time >= 1650 ? "dark" : "light"; The currentSky variable will evaluate to “dark” if the condition is true, or “light” if the condition is false. Q : What is the result of the comparison (light or dark)? In this example: time = 700; //this is 7am military time currentSky = time <= 1650 ? "light" : "dark"; What is the result of the comparison (light or dark)? Logical Operators JavaScript’s logical operators are used to determine whether an entire statement/condition is true or false depending on the operation and values involved. These can be used to assign boolean values to variables or to determine the next course of action in conditional statements. The logical operators have symbols known as the operators that are used to perform the operations 1. And : if the values on both sides of the operand are true, then the operation returns true. If one is false, the operation returns false. If both are false, the operation returns false. Operator: && Examples: x = 20; y = 30; j = 19; z = x > 10 && y < 50; //returns true