This is my code. I want to round the variable element to 2 decimal places. How do I proceed?

computed:{
    computedCrypto(){
    const element = this.limit ? this.crypto_data.slice(3,this.limit) : this.crypto_data
    for (let index = 0; index < element.length; index  ) {
        console.log(element[index].price_usd.toFixed(2)) 
    }      
  }

  },

    
   
   

     
  }

CodePudding user response：

Your commented out attempt is close, but suffers a few problems mostly to do with variable naming. To keep using a for loop you need to access the appropriate array, and either mutate or clone and reassign each object (here using spread syntax) while also reassigning each price_usd value using toFixed(2) as you were attempting. You'll note that I'm also slice()ing the crypto_data array even if there isn't a limit set in order to avoid mutating the original array.

class Example {

  constructor(limit) {
    this.crypto_data = [...Array(10).keys()].map(() => ({ price_usd: Math.random() * 10 }));
    this.limit = limit ?? 0;
  }

  computedCrypto() {
    const data = this.limit ? this.crypto_data.slice(3, this.limit) : this.crypto_data.slice();
    for (let index = 0; index < data.length; index  ) {
      data[index] = {
        ...data[index],
        price_usd: data[index].price_usd.toFixed(2)
      };
    }
    return data;
  }
}

const example = new Example(5);
console.log(example.computedCrypto());

const exampleNoLimit = new Example();
console.log(exampleNoLimit.computedCrypto());

A more succinct version could be written using map()

computedCrypto() {
  const data = this.limit
    ? this.crypto_data.slice(3, this.limit)
    : this.crypto_data;

  return data.map(o => ({ ...o, price_usd: o.price_usd.toFixed(2) }));
}