Here is the first post about ES6 features in lifestyle. This story is about let & const😎. This two guys did the old man - Var.🕵
Let's figure out, how they work in examples.
It's let, don't mess with him out from the block 😎, don't try to talk about him behind his back. If you want to make some variables only for your block, or even for each iteration of loop, let can help you.
{ /* Don't even try to talk about me behind my back, it works with var, not with me.💪 If you try, you've got reference error, boom!💥*/ console.log(varFromTheBlock); // ReferenceError let varFromTheBlock = "I'm Var from the Block, don't mess with me out from the block"; // Cause you got reference error, dude, you don't want it. console.log(varFromTheBlock); // "I'm Var from the Block, don't mess with me out from the block" } console.log(varFromTheBlock); //ReferenceError: varFromTheBlock is not defined // let in for loop var arrForIteration = []; for (let i = 0; i < 5; i++){ arrForIteration.push( function(){ console.log( i ); } ); } arrForIteration[3]();//3 It's const💪, he looks like let, but he is more principled and conservative. He is like a rock. If you want to create something, that never can be changed by somebody else, he can help you.
{ const bigConst = ['cars','weapons']; // Hey I'm bigConst and I work for some huge array.🕵 bigConst.push('cash'); // Yes I can talk with array if you want and bring him some 'cash' 💵 console.log( bigConst ); // ['cars','weapons','cash'] // But don't try to broke my powerful connections with guys, which I'm working for! bigConst = 'plant'; //TypeError // I told you! It's typeError, man. } 
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