Zak Dyer

Zak Dyer

1547995394

Can't cleanly break out of the for loop in javascript

Got this simple example:

const arr = [
  {name: 'first', amount: 2},
  {name: 'second', amount: 1},
  {name: 'third', amount: 1}
]
const obj = {name: 'second', amount: 3}

for (let i = 0; i < arr.length; i++) {
if (arr[i].name === obj.name) {
arr[i].amount += obj.amount;
break;
} else {
arr.push(obj)
}
}

I want to execute the ordinary for loop and the desired result is that if there’s an object with the same name as in the array, then just add up the amount, else I want obj to be pushed to the list. But in fact both events happen. How to make so when I break out from if statement the else statement won’t run?

#javascript #arrays #loops

What is GEEK

Buddha Community

John David

1548034690

You need another variable found and set it to true, if the data set is found. Then do not push the actual data set to the array.

Basically you neet to visit all elements and at the end decide if you add the object to the array.

With your code, you take at least one action, either update the actual data set end exit, which works only if the wanted name is in the first element, or you push an object to the array. This takes place until the wanted data set is found, or no more elements are available.

const arr = [{ name: 'first', amount: 2 }, { name: 'second', amount: 1 }, { name: 'third', amount: 1 }];
const obj = { name: 'second', amount: 3 };

var found = false;

for (let i = 0; i < arr.length; i++) {
    if (arr[i].name === obj.name) {
        arr[i].amount += obj.amount;
        found = true;
        break;
    }
}

if (!found) {
    arr.push(obj);
}

console.log(arr);
.as-console-wrapper { max-height: 100% !important; top: 0; }

Lowa Alice

Lowa Alice

1624406400

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Jackson George

1604649613

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1622207074

What is JavaScript - Stackfindover - Blog

Who invented JavaScript, how it works, as we have given information about Programming language in our previous article ( What is PHP ), but today we will talk about what is JavaScript, why JavaScript is used The Answers to all such questions and much other information about JavaScript, you are going to get here today. Hope this information will work for you.

Who invented JavaScript?

JavaScript language was invented by Brendan Eich in 1995. JavaScript is inspired by Java Programming Language. The first name of JavaScript was Mocha which was named by Marc Andreessen, Marc Andreessen is the founder of Netscape and in the same year Mocha was renamed LiveScript, and later in December 1995, it was renamed JavaScript which is still in trend.

What is JavaScript?

JavaScript is a client-side scripting language used with HTML (Hypertext Markup Language). JavaScript is an Interpreted / Oriented language called JS in programming language JavaScript code can be run on any normal web browser. To run the code of JavaScript, we have to enable JavaScript of Web Browser. But some web browsers already have JavaScript enabled.

Today almost all websites are using it as web technology, mind is that there is maximum scope in JavaScript in the coming time, so if you want to become a programmer, then you can be very beneficial to learn JavaScript.

JavaScript Hello World Program

In JavaScript, ‘document.write‘ is used to represent a string on a browser.

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	document.write("Hello World!");
</script>

How to comment JavaScript code?

  • For single line comment in JavaScript we have to use // (double slashes)
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//single line comment

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</script>

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1589255577

The essential JavaScript concepts that you should understand

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