A switch statement gives an expression a value to evaluate and several different statements to execute based on the value of the expression.<\/p>\n\n\n\n
It is a useful alternative to the If … else<\/em> statement and a much more sophisticated way to control program flow in software development.<\/p>\n\n\n\n default<\/em><\/strong>: this indicates the statement that runs if all the given conditions are not met. It is similar to the final else<\/em> block an if <\/em>statement.<\/p>\n\n\n\n break<\/strong><\/em>: the break statements indicate the end of a particular case.<\/p>\n\n\n\n Example<\/p>\n\n\n\n Let us write a simple program that checks the grade of students<\/p>\n\n\n\n\/\/Syntax\nswitch(expression) {\ncase condition1: statements\nbreak;\ncase condition2: statements\nbreak;\ncase condition3: statements\nbreak;\n\ndefault: statements\n}<\/code><\/pre>\n\n\n\n checkGrade = (val) => {\n switch(val){\n case 'A': \n console.log('Excellent');\n break;\n \n case 'B':\n console.log('Very Good');\n break;\n\n case 'C':\n console.log('Good');\n break;\n\n case 'D':\n console.log('Fairly Good');\n break;\n\n case 'E':\n console.log('Fair');\n break;\n\n case 'F':\n console.log('Fail');\n break;\n\n default: console.log('Please enter a valid grade')\n }\n }\n\n checkGrade('R') \/\/Please enter a valid grade\n checkGrade('A') \/\/Excellent<\/code><\/pre>\n\n\n\n