JavaScript tips and tricks

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Query Selector

When testing things in browser's dev tools, instead of typing the lengthy `document.querySelectorAll` you can use `$$`.

$$("div") instead of document.querySelectorAll("div") 


Determine the Weight of Your Web Page

$$("*"), this will return total number elements present in the document.

Get Unique Values of an Array

Set is used to return the unique value of an array.
var arr = [1, 2, 3, 3, 4, 5, 6, 6, 7, 7, 7, 7];
const newArr = new Set(arr);

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Comments

  1. MS DynamicsNovember 13, 2019 at 3:07 PM

    This comment has been removed by the author.

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  2. Sowmiya RJuly 26, 2020 at 8:42 PM

    Thanks for one marvelous posting! I enjoyed reading it; you are a great author.
    This is good information and really helpful for the people who need information about this.
    Really the post is very unique.every concepts are captured nice.

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