js array multiply code example

Example 1: multiply js

const multiply = (x,y)=>{
if(x==1){ return y;}
else if(x>1){
return y +multiply(x-1,y)
}
else throw "Not Numbers"
}
var result = multiply(4,3);
console.log(result)

Example 2: javascript multiply array with scalar

var input = [3, 6, 4];
var scalar = 5;
var output = input.map(x => x * scalar); // [15, 30, 20]

Example 3: multiply all numbers in an array javascript

The cause is already known. Here's an alternative - using Array.reduce for your method:

console.log( [1, 2, 3].reduce( (a, b) => a * b ) );
console.log( Array.from( {length: 20} )
  .map( (v, i) => i + 1 )
  .reduce( (a,b) => a * b )
  .toLocaleString());

// for empty arrays, use some initial value
const arr = [];
if (arr.reduce( (a, b) => a * b, -1 ) === -1) {
  console.error(`The given array ${arr} is empty`);
}