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JavaScript JavaScript Numbers Working with Numbers Numbers and Strings

Imagine you have 10 images on a web page. Each image is 190 pixels wide. Using the two variables in this script, create

script.js
const width = '190px';
const totalImages = 10;
const totalWidth = parseInt ( width * totalImages );

3 Answers

Steven Parker
Steven Parker
230,995 Points

You're close, but only the "width" needs conversion, the "totalImages" value is already a number and the math needs to be done outside of the conversion:

const totalWidth = parseInt(width) * totalImages;
Kate C
Kate C
13,589 Points

Is it possible to write like this: const totalWidth = +width * totalImages;

this didn't go through...tho Could someone tell me why?

Steven Parker
Steven Parker
230,995 Points

Type coercion (as invoked by he unary "+" trick) works when the string value only contains digits.
But the "px" in this string makes it only convertible with "parseInt".

Why mine is not working ?

const width = '190px';
const totalImages = 10;

const totalWidth = (+width * totalImages);  

const totalWidth = (+width * totalImages);
there is not need of + & you forgot the capitalization of width "W"