Sometimes, we want to fix ‘command not found: jest’ error in the command line.
In this article, we’ll look at how to fix ‘command not found: jest’ error in the command line.
To fix ‘command not found: jest’ error in the command line, we run npx.
To run jest, we run
npx jest
Then it’ll run without Jest being installed locally.
To fix ‘command not found: jest’ error in the command line, we run npx.
Sometimes, we want to pass an event object to a function in JavaScript.
In this article, we’ll look at how to pass an event object to a function in JavaScript.
To pass an event object to a function in JavaScript, we can use the addEventListener method.
For instance, we write
const onClick = (ev) => {
ev.preventDefault();
console.log("Hello World!");
};
document.getElementById("my_button").addEventListener("click", onClick);
to select the element with getElementById.
And then we add a click event listener to it with addEventListener.
We set the onClick function as the click event listener.
It takes the ev event object as its argument.
To pass an event object to a function in JavaScript, we can use the addEventListener method.
Sometimes, we want to access the last element of a TypeScript array.
In this article, we’ll look at how to access the last element of a TypeScript array.
To access the last element of a TypeScript array, we can use the length - 1 index.
For instance, we write
const items: String[] = ["tom", "jeff", "sam"];
console.log(items[items.length - 1]);
to define the items string array.
Then we get the last item from the array with index items.length - 1.
To access the last element of a TypeScript array, we can use the length - 1 index.
Sometimes, we want to convert JavaScript date object to ticks.
In this article, we’ll look at how to convert JavaScript date object to ticks.
To convert JavaScript date object to ticks, we can use the date’s getTime method.
For instance, we write
const ticks = new Date().getTime();
to create a date object and call its getTime method to return the Unix timestamp of the datetime in milliseconds.
To convert JavaScript date object to ticks, we can use the date’s getTime method.
Sometimes, we want to enforce min. zoom level when using fitBounds with Google Maps v3 and JavaScript.
In this article, we’ll look at how to enforce min. zoom level when using fitBounds with Google Maps v3 and JavaScript.
To enforce min. zoom level when using fitBounds with Google Maps v3 and JavaScript, we can set the minimum zoom level in the bounds_changed event handler.
For instance, we write
const zoomChangeBoundsListener = google.maps.event.addListener(
map,
"bounds_changed",
(event) => {
google.maps.event.removeListener(zoomChangeBoundsListener);
map.setZoom(Math.min(15, map.getZoom()));
}
);
map.fitBounds(zoomBounds);
to call addListener to listen to the bounds_changed event on the map.
In the event listener, we call map.setZoom to set the zoom level to 15 if the zoom level is below 15.
Otherwise, we use getZoom to return the zoom level and set that as the zoom level of the map.
To enforce min. zoom level when using fitBounds with Google Maps v3 and JavaScript, we can set the minimum zoom level in the bounds_changed event handler.