The JavaScript array concat() method is used to return a new array object that contains two or more merged arrays. Syntax: array.concat (array1,array2,….) Example: <!DOCTYPE html> <html> <head> </head> <body> <script> var a1=[“GOLD”,”SILVER”,”DIAMOND”]; var a2=[“RUBY”,”PLATINUM”]; var a3=[“BRONZE”]; var sum=a1.concat(a2,a3); document.writeln(sum); </script> </body> </html>
An array is a single variable that can store multiple values of the same type at a time. Thus, a Javascript array is used to hold many values of the same type under a single name. These values can be accessed by referring to their index number. An array in Javascript can be constructed in … Read more
JavaScript WeakMap object is used to store the elements as key-value pairs where keys are weakly referenced. Syntax: new WeakMap([iterable]) Where: iterable is the object whose elements are in the form of a key-value pair. Note: WeakMap object can not contain the primitive type elements. It can contain only object-type elements. JavaScript WeakMap Methods: delete() … Read more
JavaScript WeakSet object is used to store only the weakly held objects. Syntax: new WeakSet ([iterable]) Where: iterable is the object whose elements will be added to a new WeakSet. Note: WeakSet object can not contains the primitive type elements. It can contain only object-type elements. JavaScript WeakSet Methods: add() Use: To add a new … Read more
JavaScript map object is used to store the elements as key-value pair. All the operation like search, add, update, delete are done using key. Syntax: new Map([iterable]) Parameters: iterable: It represents the object whose elements are in the form of key-value pair. Note: Map object can not contain the duplicate keys but can contain duplicate … Read more
To store the elements with unique primitive values or object references, a javascript set object is used. Syntax: new Set([iterable]) Where: iterable is the object whose elements will be added to the new Set. Note: JavaScript set cannot contain duplicate elements i.e. it keeps unique elements only. JavaScript Set Methods: add() Use: To add the … Read more
As the name suggests TypedArray is an array for specific element types. There are mainly 9 types of Typed Array in Javascript. TYPEDARRAY SIZE USES TYPE RANGE Int8Array 1 8-bit 2’s complement signed integer. byte -128 to 127 Unit8Array 1 8-bit 2’s complement signed octet. octet 0 to 255 Unit8ClampedArray 1 8-bit unsigned integer (clamped) … Read more
In order to find and remove any silent error in a JavaScript code, “use strict”; expression is used. This expression is placed as the first statement in the code to enable the strict mode of debugging. Note: It will throw an error if there is there any silent error in the JavaScript code. Example: <!DOCTYPE … Read more
The mechanism of using variables and functions before their declarations by moving their declarations to the top of the code is called hoisting in Javascript. Example: <!DOCTYPE html> <html> <head> </head> <body> <script> document.write(mul(2,5,6)); function mul(a,b,c) { return a*b*c; } </script> </body> </html>
Debugging can be simply defined as a process of finding errors in a code before actual execution. A JavaScript code can be debugged using a built-in web browser debugger, in the following two ways: Using console.log() method Using debugger keyword Using console.log() method It is used to generate an error message on the console of … Read more