get only values from array javascript code example

Example 1: array objects to array of one property

let result = objArray.map(a => a.foo);

Example 2: map a property from array of objects javascript

var result = objArray.map(function(a) {return a.foo;});

Example 3: get all id from array of objects javascript

function getFields(input, field) {
    var output = [];
    for (var i=0; i < input.length ; ++i)
        output.push(input[i][field]);
    return output;
}

var result = getFields(objArray, "foo"); // returns [ 1, 3, 5 ]

Example 4: Getting One Value from an Array of Items

//Getting One Value from an Array of Items or sum of array
var numbers = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12];
var total = numbers.reduce(function(total, current) {
    return total + current;
}, 0);

console.log(total);