Reference for JavaScript (ECMAScript 2020)

The tables below show the syntactically highlighted topic for the language.

If you see any incorrect information, please help us improve! Feel free to either create an issue or use the link at the bottom of the language column to correct any information.

JavaScript (ECMAScript 2020)'s thesaurus is incomplete. Please help us improve by adding or correcting information for this language.

Conditional Statements (ifs)

Concept

JavaScript's Implementation

If conditional

if (condition) {
    statements;
}

If/Else conditional

if (condition) {
    statements;
} else {
    statements;
}

If/ElseIf conditional

if (condition) {
    statements;
} else if (condition) {
    statements;
}

If/ElseIf/Else conditional

if (condition) {
    statements;
} else if (condition) {
    statements;
} else {
    statements;
}

Switch statement

switch (expression) {
  case x:
    statements;
    break;
  case y:
    statements;
    break;
  default:
    statements;
}

Expression is compared with cases using the strict === comparator

Pattern matching

Unknown

Ternary conditional

condition ? exprIfTrue : exprIfFalse

Loops

Concept

JavaScript's Implementation

While loop

while (condition) {
    statements;
}

Do/While loop

do {
    statements;
} while (condition);

Until loop

Not Implemented In This Language

Do/Until loop

Not Implemented In This Language

For loop

for (initialization_statement; condition; update_statement){
    statements;
}

Foreach loop

// Example 1
for(const element of array) { ... }
// Example 2
array.forEach(function(currentValue, index, arr), thisValue)
// Example 3
for(const propertyName in object) { ... }

The for...of loop is intended for arrays and provides the entire element. The for...in loop works on objects and arrays and returns the key, requiring the value to be dereferenced such as object[propertyName]. The array.forEach(...) loop is a functional iterator provided only on arrays.

Breaking out of a loop

Unknown

Continuing to the next iteration of a loop

Unknown

List Comprehension

Unknown

Iterations

Concept

JavaScript's Implementation

Each iteration

Not Implemented In This Language

Map iteration

array.map(function(currentValue, index, arr), thisValue)

Filter iteration

array.filter(function(currentValue, index, arr), thisValue)

Fold iteration

Not Implemented In This Language

Resource Management

Concept

JavaScript's Implementation

Context manager or with/using statement

Unknown

Defer statement

Unknown

Want to add or correct information for JavaScript?

or get the complete template.

control_structures.json