JavaScript map() method in 7 minutes! 🗺️

Web Reference: Novice JavaScript developers need to know that the "not not" operator is using implicitly the original loose comparison method instead of the exact or operators and also the hidden cast operation that is happening behind the scenes and I show it in the example I provide. Related to Is there a "null coalescing" operator in JavaScript? - JavaScript now has a ?? operator which I see in use more frequently. Previously most JavaScript code used ||. let userAge = Dec 11, 2008 · I'm using JSLint to go through JavaScript, and it's returning many suggestions to replace == (two equals signs) with === (three equals signs) when doing things like comparing idSele_UNVEHtype.value.

YouTube Excerpt: 00:00:00 introduciton 00:00:16 example 1 00:02:13 example 2 00:03:58 example 3 // .map() = accepts a callback and applies that function // to each element of an array, then return a new array // ------------ EXAMPLE 1 ------------ const numbers = [1, 2, 3, 4, 5]; const squared = numbers.map(square); const cubed = numbers.map(cube); console.log(cubed); function square(element){ return Math.pow(element, 2); } function cube(element){ return Math.pow(element, 3); } // ------------ EXAMPLE 2 ------------ const students = ["Spongebob", "Patrick", "Squidward", "Sandy"]; const studentsUpper = students.map(upperCase); const studentsLower = students.map(lowerCase); console.log(studentsLower); function upperCase(element){ return element.toUpperCase(); } function lowerCase(element){ return element.toLowerCase(); } // ------------ EXAMPLE 3 ------------ const dates = ["2024-1-10", "2025-2-20", "2026-3-30"]; const formattedDates = dates.map(formatDates); console.log(formattedDates); function formatDates(element){ const parts = element.split("-"); return `${parts[1]}/${parts[2]}/${parts[0]}`; }

00:00:00 introduciton 00:00:16 example 1 00:02:13 example 2 00:03:58 example 3 // .map() = accepts a callback and applies that function // ...

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