JavaScript ES6
In this tutorial, you will learn about ES6 with help of Examples:
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More significant changes than ES5
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Much new syntax
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Very, Very high back compat
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ECMAScript 2015 is also known as ES6 and ECMAScript 6.
There are describes the most important features of ES6, are as follows:-
New Features in ES6
There are various new features in JavaScript:-
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The let keyword
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The const keyword
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Arrow Functions
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For/of
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Map Objects
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Set Objects
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Classes
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Promises
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Symbol
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Default Parameters
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Function Rest Parameter
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String.includes()
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String.startsWith()
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String.endsWith()
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Array.from()
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Array keys()
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Array find()
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Array findIndex()
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New Math Methods
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New Number Properties
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New Number Methods
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New Global Methods
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Object entries
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JavaScript Modules
JavaScript Let
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Let is a block level variable.
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Let you declare variables that are limited in scope to the block, statement, or expression.
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Using var we can define a variable either globally, or locally to the entire function regardless of clock scope.
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Let doesn’t allow duplicate variable creation.
Using let keyword in another example, a, b, and c, are variables is as follows:
Example -
Output
JavaScript Const
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Constants are block level scope variables. The scope may be either global or local scope.
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Constants are working like variables defined using let statements.
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We can’t modify the value of constants.
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Constant re-declarations are not allowed.
Using const keyword in another example, a, b, and c, are variables is as follows:
If you want a general rule: always declare variables with const.
If you think the value of the variable can change, use let.
Example -
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JavaScript Arrow Function
In this tutorial, you will learn about Arrow Function in JavaScript with the help of Example:
Arrow functions were introduced in ES6.
Arrow functions help us to write shorter function syntax is as follows:
Example 1 -
Output -
JavaScript For Of
The for...of statement used to creates a loop iterating over iterable objects and over the built-in String, Array, array-like objects (e.g., arguments or NodeList), TypedArray, Map, Set and user-defined iterables etc..
The Syntax of for Of Loop is as follows:
for (element of iterable) {
// body of for… of
}
Example 1 -
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