JavaScript equivalent to Ruby's .each

Question

Does JavaScript have an equivalent to Ruby's .each method?

For example Ruby:

arr = %w(1 2 3 4 5 6 7 8 9 10)
arr.each do |multi|
 sum = multi * 2
 puts "The sum of #{multi} ^ 2 = #{sum}"
end
#<=The sum of 1 ^ 2 = 11
 The sum of 2 ^ 2 = 22
 The sum of 3 ^ 2 = 33
 The sum of 4 ^ 2 = 44
 The sum of 5 ^ 2 = 55
 The sum of 6 ^ 2 = 66
 The sum of 7 ^ 2 = 77
 The sum of 8 ^ 2 = 88
 The sum of 9 ^ 2 = 99
 The sum of 10 ^ 2 = 1010

Does JavaScript have an equivalent to something like this?

• 13aal: @isvforall Can you give me an example of using foreach? Is it the same as using the for loop?
• Heretic Monkey: Can you look up forEach on the internet? You are expected to do a minimum of research before asking questions on SO. See How to Ask.
• 13aal: @MikeMcCaughan I actually looked up javascript equivelent to Rubys.each before asking, but thanks.

Answer 1

You are looking for Array.prototype.forEach function

var arr = ['1', '2', '3', '4', '5'];
arr.forEach(multi => {
 var sum = multi.repeat(2);
 console.log(`The sum of ${multi} ^ 2 = ${sum}`);
});

Working example:

var arr = ['1', '2', '3', '4', '5'];
arr.forEach(multi => {
 var sum = multi.repeat(2);
 document.write(`The sum of ${multi} ^ 2 = ${sum}</br>`);
});

Answer 2

An equivalent is

myArray.forEach(callback);

where callback is your callback function. In this case, the function that is going to be executed for each element.

Note that callback can be passed in to ways:

First:

myArray.forEach(function(element, index, array){
 //Operations
 console.log(element)
});

Second:

function myCallback(element, index, array){
 //Operations
 console.log(element)
}
myArray.forEach(myCallback);

Answer 3

var arr=[1, 2, 3, 4, 5,6, 7, 8, 9, 10];
arr.forEach(function(element,index){
 var sum = element.toString() + element.toString();
 console.log("The sum of "+ element+"^ 2 = "+sum);
});