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JavaScript

Posted by Evan Hacker
Evan Hacker
6,898 Points

My code. I rewrote it 3 times to get it this short. From 51 lines down to 11. Can it be any shorter?

alert("Let's do some math!")
const num1=+prompt("Number #1")
const num2=+prompt("Number #2")

const message = `<h1>Basic Math with Numbers ${num1} and ${num2}</h1>
                <h2>${num1} + ${num2} = ${num1 + num2} <br>
                ${num1} - ${num2} = ${num1-num2}<br>
                ${num1} * ${num2} = ${num1*num2}<br>
                ${num1} / ${num2} = ${num1/num2}</h2>`;

document.querySelector("body").innerHTML= message

2 Answers

Steven Parker
Steven Parker
231,140 Points
Steven Parker
Steven Parker
231,140 Points

Down from 51? Good job! :+1: But any shorter and it will start becoming pretty obscure and hard to read. The unary plus instead of "parseInt" is already leaning in that direction.

And for "best practice" code, always end a statement with a semicolon, even when you can get by without one.

Jillian Lee
.a{fill-rule:evenodd;}techdegree
Jillian Lee
Full Stack JavaScript Techdegree Student 4,171 Points

Can unary plus replace parseInt? I didn't realize =+ also converts a string to an integer. If so, why use parseInt?

Steven Parker
Steven Parker
231,140 Points
Steven Parker
Steven Parker
231,140 Points

They aren't quite the same. For examples, parseInt("12px") is 12 but +"12px" is NaN . On the other hand, parseInt("") (on an empty string) is NaN but +"" is 0.

Jillian Lee
.a{fill-rule:evenodd;}techdegree
Jillian Lee
Full Stack JavaScript Techdegree Student 4,171 Points

Got it! Thank you.

Evan Hacker
Evan Hacker
6,898 Points
Evan Hacker
Evan Hacker
6,898 Points

Thank you Steven Parker. Yes I understand the semicolon, I will try to be more careful about that. I appreciate your feedback