1. The Ternary Operator
This is a terrific code saver when you wish to compose an
if. else statement in just one line.
const x = 20; let answer; if (x > > 10 ) answer="greater than 10"; else
const answer = x > > 10? "greater than 10": "less than 10";
You can also nest your
if statement like this:
const answer = x > > 10? "greater than 10": x < < 5? "less than 5":"
between 5 and 10"; 2. Short-circuit Evaluation Shorthand
When assigning a variable worth to another variable, you may wish to ensure that the source variable is not null, undefined, or empty. You can either write a long
if statement with multiple conditionals, or utilize a short-circuit examination.
if (variable1!== null|| variable1!== undefined|| variable1!== ") let variable2 = variable1;
const variable2 = variable1|| 'brand-new';.
Don't believe me? Evaluate it yourself (paste the following code in ):
let variable1;. let variable2 = variable1|| 'bar';. console.log( variable2 === 'bar');// prints real. variable1='foo';. variable2 = variable1|| 'bar';. console.log( variable2);// prints foo.
Do note that if you set
0, the worth
bar will be assigned.
3. Stating Variables Shorthand
It's good practice to declare your variable tasks at the beginning of your functions. This shorthand technique can conserve you great deals of time and space when stating multiple variables at the exact same time.
let x;. let y;. let z = 3;.
let x, y, z= 3;.
4. If Existence Shorthand
This may be unimportant, but worth a reference. When doing "
if checks", task operators can sometimes be omitted.
Note: these two examples are not precisely equivalent, as the shorthand check will pass as long as
Here is another example. If
a is NOT equivalent to true, then do something.
let a;. if (a!== true)
let a;. if (! a) do something ...
const fruits = [' mango', 'peach', 'banana'];.
for (let i = 0; i <
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