12 Ways to Create Variables in JavaScript
March 20, 2021
In this video, I’ll show you how to create variables in JavaScript using 12 different ways. Chances are you will probably never use most of them in your code, but for the love of coding and because JavaScript lets you do it, we’ll explore its capabilities.
#1. Using let
#2. Using const
#3. Using var
#4. Using no keyword (globally)
#5. Using globalThis keyword
#6. Using this keyword
#7. Using window keyword
#8. Using window’s constructor’s prototype property
#9. Using this constructor’s prototype property
#10. Using this constructor’s prototype property
#11. Using object instance __proto__
#12. Using object literal __proto__
JavaScript
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45
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const data = ["-- offset index keys --"]2
/*-------------------------------*/3
4
//#1: let5
let a = "Aiden";6
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//#2: const8
const b = "Bailey";9
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//#3: var11
var c = "Charlie";12
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//#4: <global>14
d = "Dawn";15
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//#5: globalThis17
globalThis.e = "Eli";18
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//#6: this20
this.f = "Fiona";21
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//#7: window23
window.g = "Gaius";24
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//#8: window's constructor's prototype26
window.constructor.prototype.h = "Helen";27
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//#9: this as in #829
this.constructor.prototype.i = "Ichiro";30
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//#10: Object's prototype32
Object.prototype.j = "Jasmine";33
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//#11: Object instance __proto__35
//const obj = new Object();36
const obj = {};37
obj.__proto__.k = "Kal-el";38
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//#12: Object literal __proto__40
//(new Object()).__proto__.l = "Lana";41
({}).__proto__.l = "Lana";42
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/*-------------------------------*/44
data.push(a,b,c,d,e,f,g,h,i,j,k,l)45
console.table(data);
