Let's dive into the explanation.

The benchmark tests two different approaches to switch between multiple values in JavaScript: using an if-else statement or using a switch statement with an array of expected values and the includes() method.

Test Case 1: Switch with includes

This test case uses a switch statement with an array of expected values (["abc", "bcd", "cde", "def"]) and checks if each value is included in that array. If it is, the corresponding console.log(str) statement is executed.

The code snippet:

var testString = "abc.bcd.cde.def.asdb.asdb.asdb.asdb.asdb.asdb.asdb.asdb.asdb.asdb.asdb.asdb.asdb.asdb.asdb.asdb.asdb.asdb.asdb";
testString.split(".").forEach(str => {
  if(["abc","bcd","cde","def"].includes(str)){
    switch(str){
      case "abc":
        console.log(str);
      case "bcd":
        console.log(str);
      case "cde":
        console.log(str);
      case "def":
        console.log(str);
      default:
    }
  }
});

Test Case 2: If-else

This test case uses an if-else statement chain to switch between multiple values. For each value, a separate console.log(str) statement is executed.

The code snippet:

var testString = "abc.bcd.cde.def.asdb.asdb.asdb.asdb.asdb.asdb.asdb.asdb.asdb.asdb.asdb.asdb.asdb.asdb.asdb.asdb.asdb.asdb";
testString.split(".").forEach(str => {
  if(str === "abc"){
    console.log(str);
  } else if(str === "bcd"){
    console.log(str);
  } else if(str === "cde"){
    console.log(str);
  } else if(str === "def"){
    console.log(str);
  }
});

Comparison

The benchmark results show that the if-else approach is significantly slower (8876.55 executions per second) compared to the switch with includes approach (21,573.59 executions per second). This suggests that using a switch statement with an array of expected values can be a more efficient way to switch between multiple values in JavaScript.

Pros and Cons

• Switch with includes:
  • Pros:
    • More concise code
    • Faster execution speed (based on the benchmark results)
  • Cons:
    • May not work if the array of expected values is not exhaustive
    • Can be less readable than an if-else statement chain
• If-else:
  • Pros:
    • More explicit and easier to read
    • Works even if the array of expected values is not exhaustive
  • Cons:
    • Longer code due to the need for multiple if statements
    • Slower execution speed (based on the benchmark results)

Other Considerations

• The choice between switch with includes and if-else depends on the specific use case and personal preference. If conciseness and performance are priorities, switch with includes might be a better choice.
• In cases where the array of expected values is not exhaustive, an if-else statement chain or another approach should be used to ensure accurate switching behavior.

No external libraries or special JS features are used in these test cases. The only JavaScript feature used is the includes() method, which checks if a value exists within an array.