Web developer specializing in React, Vue, and front end development.
To set boolean values in LocalStorage with JavaScript, we can parse the string value into a boolean with JSON.parse.
For instance, we write
const value = "true";
console.log(JSON.parse(value) === true);
to parse 'true' back into true with JSON.parse.
Then the console log should log true since the left side returns true.
Sometimes, we want to unpack array into separate variables in JavaScript.
In this article, we’ll look at how to unpack array into separate variables in JavaScript.
To unpack array into separate variables in JavaScript, we use the array destructuring syntax.
For instance, we write
const [x, y] = ["foo", "bar"];
console.log(x);
console.log(y);
to assign 'foo' to x and 'bar' to y.
To unpack array into separate variables in JavaScript, we use the array destructuring syntax.
Sometimes, we want to check if mouse button down with JavaScript.
In this article, we’ll look at how to check if mouse button down with JavaScript.
To check if mouse button down with JavaScript, we listen for the mousedown and mouseup events.
For instance, we write
let mouseDown = false;
document.body.onmousedown = () => {
mouseDown = true;
};
document.body.onmouseup = () => {
mouseDown = false;
};
if (mouseDown) {
// ....
}
to listen for the mousedown event on the body element with
document.body.onmousedown = () => {
mouseDown = true;
};
We set mouseDown to true in document.body.onmousedown since the mouse button is down.
Likewise, we listen to the mouseup event with
document.body.onmouseup = () => {
mouseDown = false;
};
And we set mouseDown to false.
Then we do something is mouseDown is true with
if (mouseDown) {
// ....
}
To check if mouse button down with JavaScript, we listen for the mousedown and mouseup events.
Sometimes, we want to run only one test with Cypress and JavaScript.
In this article, we’ll look at how to run only one test with Cypress and JavaScript.
To run only one test with Cypress and JavaScript, we can set the --space option or use the it.only method.
For instance, we run
cypress run --spec path/to/file.spec.js
to run the tests in path/to/file.spec.js.
In our test, we write
it.only("only run this one", () => {
// ...
});
it("not this one", () => {});
to run only the first test by calling creating the test with it.only.
To run only one test with Cypress and JavaScript, we can set the --space option or use the it.only method.
Sometimes, we want to share variables between files in Node.js.
In this article, we’ll look at how to share variables between files in Node.js.
To share variables between files in Node.js, we export the variables and then import them where we want to use them.
For instance, we write
module.js
const name = "foobar";
exports.name = name;
to export the name variable with
exports.name = name;
Then we import module.js and use name in main.js with
const myModule = require("./module");
const name = myModule.name;
To share variables between files in Node.js, we export the variables and then import them where we want to use them.