Difference between revisions of "Operators"
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isFullAge(1990,1921,1967); | isFullAge(1990,1921,1967); | ||
== Default Parameters === | |||
function Person(first, last = 'bacchas'){ | |||
this.firstname = first; | |||
this.lastname = last; | |||
} | |||
== Maps == | |||
''' New key value data structure''' | |||
<pre> | |||
const question = new Map(); | |||
question.set('question', 'what is'); | |||
question.set(1,'es5); | |||
question.set(2, 'es6'); | |||
question.set(3, 'ES2015'); | |||
question.set('correct', 3); | |||
question.set(True, 'Correct Answer'); | |||
question.set(false, 'wrong'); | |||
// Retrieve DAta | |||
question.get('question') | |||
// get size | |||
question.size; | |||
// delete | |||
question.delete(2); | |||
// delete All | |||
question.clear(); | |||
// loop | |||
question.forEach((value,key)=> console.log(`this ${key}, and its set ot ${vlaue}) | |||
// Another Way to Loop | |||
for(let[key, value]of question.entries()){ | |||
console.log(`this ${key}, and its set ot ${vlaue}); | |||
if(typeof(key)=== 'number'){ | |||
console.log(`Answer ${key}, and its set ot ${vlaue}); | |||
} | |||
</pre> | |||
==[[#top|Back To Top]]-[[Main_Page| Home]] - [[Java Script|Category]]== | ==[[#top|Back To Top]]-[[Main_Page| Home]] - [[Java Script|Category]]== |
Latest revision as of 23:36, 2 December 2016
ES6 Spread Operator
ES6 Equivalent Spread Operator
const sum3 = addFourAges(...ages); // the ... means the ages array is expanded into individual components.
Join two Arrays
const arrayOne= ['hello', 'two']; const arrayTwo = ['three', 'four']; const arrayThree = [...arrayOne, ...arrayTow];
Looping through all elements and changing the color
const h = document.querySelector(h1) const boxes = documwnt.querySelectorAll('.box');
const all = [h, ...boxes]; Array.form(all).forEach(cur=> cur.style.color='purple') // returns an array
Rest Parameter
function isFullAge(...years){ years.forEach(cur=> (216-cur)>=18); } isFullAge(1990,1921,1967);
Default Parameters =
function Person(first, last = 'bacchas'){ this.firstname = first; this.lastname = last;
}
Maps
New key value data structure
const question = new Map(); question.set('question', 'what is'); question.set(1,'es5); question.set(2, 'es6'); question.set(3, 'ES2015'); question.set('correct', 3); question.set(True, 'Correct Answer'); question.set(false, 'wrong'); // Retrieve DAta question.get('question') // get size question.size; // delete question.delete(2); // delete All question.clear(); // loop question.forEach((value,key)=> console.log(`this ${key}, and its set ot ${vlaue}) // Another Way to Loop for(let[key, value]of question.entries()){ console.log(`this ${key}, and its set ot ${vlaue}); if(typeof(key)=== 'number'){ console.log(`Answer ${key}, and its set ot ${vlaue}); }