Array Reduce Mdn Code Example

Example 1: reduce javascript

const sum = array.reduce((accumulator, element) => {   return accumulator + element; }, 0); // An example that will loop through an array adding // each element to an accumulator and returning it // The 0 at the end initializes accumulator to start at 0 // If array is [2, 4, 6], the returned value in sum // will be 12 (0 + 2 + 4 + 6)  const product = array.reduce((accumulator, element) => {   return accumulator * element; }, 1); // Multiply all elements in array and return the total // Initialize accumulator to start at 1 // If array is [2, 4, 6], the returned value in product // will be 48 (1 * 2 * 4 * 6)

Example 2: javascript reduce

var array = [36, 25, 6, 15];  array.reduce(function(accumulator, currentValue) {   return accumulator + currentValue; }, 0); // 36 + 25 + 6 + 15 = 82

Example 3: reduce()

const array1 = [1, 2, 3, 4]; const reducer = (accumulator, currentValue) => accumulator + currentValue;  // 1 + 2 + 3 + 4 console.log(array1.reduce(reducer)); // expected output: 10  // 5 + 1 + 2 + 3 + 4 console.log(array1.reduce(reducer, 5)); // expected output: 15

Example 4: .reduce mdn

arr.reduce(callback( accumulator, currentValue[, index[, array]] )[, initialValue])

Example 5: reduce javascript

//note idx and sourceArray are optional const sum = array.reduce((accumulator, element[, idx[, sourceArray]]) => { 	//arbitrary example of why idx might be needed 	return accumulator + idx * 2 + element  }, 0);

Example 6: reduce mdn

array.reduce(callback( accumulator, valueNow[, index[, array]] )[, initialValue]))