How to sum an array in javascript

Method: 1. Use the statement "a.forEach(function(value){sum =value})"; 2. Use "a.reduce(function(pre,curr){sum=pre curr}) "; 3. Use "eval(a.join(" "))".

The operating environment of this tutorial: windows7 system, javascript version 1.8.5, Dell G3 computer.

javascript sums arrays

Method 1: Use forEach() method

forEach () method is used to call each element of the array and pass the element to the callback function.

Example: Accumulate and sum array values

var a = [10, 11, 12], sum = 0;
a.forEach(function(value) {
	sum += value;
});
console.log(sum);

Output result:

Method 2: Use reduce() method

var a = [11, 12, 13], sum = 0;
a.reduce(function(pre,curr) {
	sum=pre+curr;
	return sum;
});
console.log(sum);

Method 3: Use eval() method

var a = [12, 13, 14], sum = 0;
sum=eval(a.join("+"));
console.log(sum);

[Recommended learning: javascript advanced tutorial]

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