Question

157

Angular 4 - Sum of Array

rated 0 times [ 161] [ 4] / answers: 1 / hits: 23408 / 7 Years ago, sat, november 4, 2017, 12:00:00

new to ng4/typescript and having some difficulty. How do I sum the items in an array?

Added screenshot of what it looks like in action for example

        for (let card of this.cards) {

              for (let val of card.cards){

                if(val.value == JACK){

                  val.value = 10;

                }

                if (val.value == QUEEN){

                  val.value = 10;

                }

                if (val.value == KING){

                  val.value = 10;

                }

                if (val.value == ACE){

                  val.value = 10;

                }



                this.hand = Number(val.value) + Number(val.value); (I'm sure this is wrong)



             }

          }

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nestorjarettg

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2 Years ago

answered 7 Years ago breap · Accepted Answer

Use Array#Reduce:

// Array of numbers

var array = [1,2,3,4,5];

var sum = array.reduce((acc, cur) => acc + cur, 0);

console.log(sum)



// Array of strings

var toNumber = ['1','2','3','4','5'];

var sumNumber = toNumber.reduce((acc, cur) => acc + Number(cur), 0)

console.log(sumNumber);