main.md

Find the max value in an array:

Math.max(...array)

Remove duplicates from an array:

[...new Set(array)]

Get the current date and time:

new Date().toString()

Convert an object to an array:

Object.values(object)

Count the occurrences of an element in an array:

array.filter(x => x === element).length

Create a new object with a dynamic key and value:

{ [key]: value }

Mock window.location in unit tests

beforeEach(() => {
 const urlparams = `firstparam=thisismyfirstparamvalue`;
 window.history.pushState({}, 'Page title while testing', `/myurl/with/params?${search}`);
});

Hide promoted jobs in Linkedin

javascript:var i=0,x=document.getElementsByClassName('jobs-search-results-list')[0];function phase2(){document.querySelectorAll("li").forEach(function(e){e.id&&e.innerHTML.match(/Promoted/)&&e.remove()}),setTimeout(function(){x.scrollTop=0},0)}!function e(){x.scroll(0,100*++i),i>40?phase2():setTimeout(e,0)}();