if statement

In FXS, you can use an if statement in the following format:

• 'if (expression) statement': When 'expression' is truthy, the 'statement' is executed.
• 'if (expression) statement1 else statement2': When 'expression' is truthy, 'statement1' is executed. Otherwise, execute 'statement2'.
• `if ... else if ... else statementN' With this sentence pattern, you can choose one of the executions between 'statement1 ~ statementN'.

Example syntax

 if ...

if (expression) statement;

if (expression)
  statement;

if (expression) {
  Code blocks;
}


 if ... else

if (expression) statement;
else statement;

if (expression)
  statement;
else
  statement;

if (expression) {
  Code blocks;
} else {
  Code blocks;
}

 if ... else if ... else ...

if (expression) {
  Code blocks;
} else if (expression) {
  Code blocks;
} else if (expression) {
  Code blocks;
} else {
  Code blocks;
}

switch statement

Example syntax

switch ( expression ) {
  case variable:
    statement;
  case number:
    statement;
    break;
  case string:
    statement;
  default:
    statement;
}

• The 'default' branch can be omitted without writing.
• The 'case' keyword can only be used after: 'variable', 'number', 'string'.

Sample code

var exp = 10;

switch ( exp ) {
case "10":
  console.log("string 10");
  break;
case 10:
  console.log("number 10");
  break;
case exp:
  console.log("var exp");
  break;
default:
  console.log("default");
}

Output:

for statement

Example syntax

for (statement; statement; statement)
  statement;

for (statement; statement; statement) {
  Code blocks;
}

• Support for using 'break', 'continue' keywords.

Sample code

for (var i = 0; i < 3; ++i) {
  console.log(i);
  if( i >= 1) break;
}

Output:

while statement

Example syntax

while (expression)
  statement;

while (expression){
  Code blocks;
}

do {
  Code blocks;
} while (expression)

• When the expression is 'true', the loop executes the 'statement' or 'code block';
• Support for using 'break', 'continue' keywords.