Web Development Articles - Page 669 of 1049

The atanh() function of the Math object accepts a number and returns its hyperbolic arc arctangent value in radians. To convert the resultant value into degrees, multiply it with 180 and divide the result by 3.14159 (pi value).SyntaxIts Syntax is as followsMath.atanh(0.5)Example Live Demo    JavaScript Example           var result = Math.atanh(0.5);       document.write("arctangent value: "+result);       document.write("");       document.write("hyperbolic arctangent value in degrees: "+result*180/Math.PI);     Outputarctangent value: 0.5493061443340548 arctangent value in degrees: 31.47292373094538

The asinh() function of the Math object accepts a number and returns its hyperbolic arc sine value in radians. To convert the resultant value into degrees, multiply it with 180 and divide the result by 3.14159 (pi value).SyntaxIts Syntax is as followsMath.asinh(0.5)Example Live Demo    JavaScript Example           var result = Math.asinh(90);       document.write("Hyperbolic arcsine value: "+result);       document.write("");       document.write("Hyperbolic arcsine value in degrees: "+result*180/Math.PI);     OutputHyperbolic arcsine value: 5.192987713658941 Hyperbolic arcsine value in degrees: 297.53627905594817

The acosh() function of the Math object accepts a number and returns its hyperbolic arc cosine value in radians. To convert the resultant value into degrees, multiply it with 180 and divide the result by 3.14159 (pi value).SyntaxIts Syntax is as followsMath.acosh(0.5)Example Live Demo    JavaScript Example           var result = Math.acosh(90);       document.write("Hyperbolic arccosine value: "+result);       document.write("");       document.write("Hyperbolic arccosine value in degrees: "+result*180/Math.PI);     OutputHyperbolic arccosine value: 5.192925985263684 Hyperbolic arccosine value in degrees: 297.5327422794238

The keys() function of Map object is similar to entries but, it returns an iterator object containing the keys of a map object.SyntaxIts Syntax is as followsMap.keys()Example Live Demo    JavaScript Example           var mapVar = new Map();       mapVar.set('1', 'Java');       mapVar.set('2', 'JavaFX');       mapVar.set('3', 'HBase');       mapVar.set('4', 'Neo4j');       var it = mapVar.keys();       for(i=0; i

The has() function of Map object accepts a key in string format and returns a boolean value, if specified key exists it returns true else returns false.SyntaxIts Syntax is as followsmapVar.has()Example Live Demo    JavaScript Example           var mapVar = new Map();       mapVar.set('1', 'Java');       mapVar.set('2', 'JavaFX');       mapVar.set('3', 'HBase');       mapVar.set('4', 'Neo4j');       document.write(mapVar.has('3'));     OutputtrueExample Live Demo    JavaScript Example           var mapVar = new Map();       mapVar.set('1', 'Java');     ... Read More

The get() function of Map object accepts a key in string format and returns its respective value.SyntaxIts Syntax is as followsmapVar.get()Example Live Demo    JavaScript Example           var mapVar = new Map();       mapVar.set('1', 'Java');       mapVar.set('2', 'JavaFX');       mapVar.set('3', 'HBase');       mapVar.set('4', 'Neo4j');       document.write(mapVar.get('3'));     OutputHBase

The forEach() function of Map object returns an iterator of the corresponding Map object and using this you can retrieve the key Value pairs of the map.SyntaxIts Syntax is as followsmapVar.forEach()Example Live Demo    JavaScript Example           var mapVar = new Map();       mapVar.set('1', 'Java');       mapVar.set('2', 'JavaFX');       mapVar.set('3', 'HBase');       mapVar.set('4', 'Neo4j');       function show(values) {          document.write(values);          document.write("");       }       mapVar.forEach(show);     OutputJava JavaFX HBase Neo4j

The entries() function of Map object returns an iterator of the corresponding Map object and using this you can retrieve the key Value pairs of the map.SyntaxIts Syntax is as followsmapVar.entries()Example Live Demo    JavaScript Example           var mapVar = new Map();       mapVar.set('1', 'Java');       mapVar.set('2', 'JavaFX');       mapVar.set('3', 'HBase');       mapVar.set('4', 'Neo4j');       var it = mapVar.entries();       for(i=0; i

The delete() function of Map object accepts a string representing the key of an element of a map and deletes from the current Map object. This function returns true if the specified key exists in the map object else it returns false.SyntaxIts Syntax is as followsmapVar.delete()Example Live Demo    JavaScript Example           var mapVar = new Map();       mapVar.set('1', 'Java');       mapVar.set('2', 'JavaFX');       mapVar.set('3', 'HBase');       mapVar.set('4', 'Neo4j');       var map = mapVar.delete('4');       document.write("Size of the map object: "+mapVar.size);   ... Read More

The clear() function of Map object removes all elements from the current Map object.SyntaxIts Syntax is as followsmapVar.clear()Example Live Demo    JavaScript Example           var mapVar = new Map();       mapVar.set('1', 'Java');       mapVar.set('2', 'JavaFX');       mapVar.set('3', 'HBase');       mapVar.set('4', 'Neo4j');       var map = mapVar.clear();       document.write("Size of the map object: "+mapVar.size);     OutputSize of the map object: 0Example Live Demo    JavaScript Example           var mapVar = new Map();       ... Read More