why does my javascript for loop create an infinite loop?-CodePudding

I am taking a Javascript class and I'm working on my own project. I am currently stuck on a for loop and was hoping someone could help.

This is the code I have written:

console.log(`-----WATER REFILL STRATEGY-----`);
console.log(totalWaterToDrink, waterPerHour(raceInfo.tempHigh));

let waterHourFinal = waterPerHour(raceInfo.tempHigh);
console.log(waterHourFinal);

for (let j = totalWaterToDrink; j > 0; j - waterHourFinal) {
  console.log(`${j - waterHourFinal} water left`);
}

for (let i = 0; i < raceTime; i  ) {
  console.log(`Hour ${i   1}: drink $INPUT OZ PER HR HERE.`);
}

The problem exists with the For loop involving J. I get an infinite output and I am not sure why.

This is literally my first coding question to the public ever so be nice. ;)

Thanks! (and if there is a better way to ask questions, please let me know)

My code:

The output:

CodePudding user response：

You need to use -= instead of -

for (let j = totalWaterToDrink; j > 0; j -= waterHourFinal) {
  console.log(`${j - waterHourFinal} water left`);
}

CodePudding user response：

You need to write j = j - waterHourFinal instead of j - waterHourFinal

for (let j = totalWaterToDrink; j > 0; j -= waterHourFinal) {
   console.log(`${j - waterHourFinal} water left`);
}

Short hand for j = j - waterHourFinal could be j -= waterHourFinal

CodePudding user response：

You should study the for loop better

for (let j = totalWaterToDrink; j > 0; j - waterHourFinal) {
    console.log(`${j - waterHourFinal} water left`);
}

I think the j > 0; is wrong When you say greater than 0, the loop continues till infinity. You should use something like for (let j = 0; j < totalWaterToDrink; j--)

Also the for loop takes three values init;condition;increment_or_decrement; where increment_or_decrement is usually handled by or -- I hope you find this useful :).