create a new variable automaticaly-CodePudding

This is a general question. But an answer in JavaScript would suit me the best. I'm searching for a way to create variables after a pattern automatically. For example, I want to create a while-loop in which a variable gets declared. In set loop, I want to create the variable car1. However, in the next loop pass I want to do the same thing BUT call the Variable car2 this time. I'll try to write it in pseudocode:


//this should happen in the first loop
while(true){
  var car1 = 1   2;
  console.log(car1)
}

//this should happen in the second loop
while(true){
  var car2 = 1   2;
  console.log(car)
}

//In both cases "3" should be the output. But different Variables

Contrary to this example. I want to do all this in a single while loop. And on every while loop, a new variable should be created. So car1,car2,car3,car4.

Thanks in advance!

CodePudding user response：

Maybe you can use an array and add an item every loop iteration or a hash map with a naming convention you set for the keys

CodePudding user response：

You can try to use globalThis or window.

function nameFunction(name, f) {
  return {
    [name](...args) {
      return f(...args)
    }
  }[name]
}

// use globalThis
for (let i = 1; i <= 3; i  ) {
  const funcName = `car${i}`;
  const func =
    nameFunction(funcName, () => console.log(`this is car ${i}`));
  globalThis[funcName] = func;
}

car1(); car2(); car3();

// use window
for (let i = 4; i <= 6; i  ) {
  const funcName = `car${i}`;
  const func =
    nameFunction(funcName, () => console.log(`this is car ${i}`));
  window[funcName] = func;
}

car4(); car5(); car6();

CodePudding user response：

I hope this link will help you with this problem.

JS Dynamic Variable

Here they have discussed 2 ways of solving the problem. (One with "eval" and the other with "windows" object.