CODEWITHSUNDEEP
javascript
Petro Adamovich
Petro Adamovich

Reputation: 41

When to use semicolons and brackets

I am still having a hard time figuring out when to use semicolons ; and brackets {}. Anyone break it down for me? This I think is the hardest part of coding. Thanks!

Upvotes: 3

Views: 531

Answers (4)

Grijesh Chauhan
Grijesh Chauhan

Reputation: 58251

When you complete a statement (a statement can be declaration, function call, any expression e.g assignment expression) then you should add ; For example: 

var i = 10;  // declaration 
fun(10); // calling a function 
i = j + 3 && 20;  // an expression

You should use { } for you wants to make a block of statements generally when you defines function, while, for, if, switch-case etc.

Example:

(1)

if(a = b){
  fun(2);  // call a function 
  a = a + b;
}

(2) 

while(1){
  statement-1; 
  statement-2; 
}

(3) function: 

function f(var){
    statement-1; 
    statement-2; 
}

Special more cases:

You need ; after } in a for dict and function: 

var foo = function() {
    statement-1; 
};  // not your need both `;` and `}`

This value both function definition and assignment expression

objects: 

var obj = {
  a : 1,
  b: 2,
};  // not you uses both `;` and `}`

Upvotes: 0

Bleeding Fingers
Bleeding Fingers

Reputation: 7129

Curly braces {} are for code blocks which can contain multiple to single code statements. Where as a semicolon ; is to delineate or tell the compiler where a particular line of code ends.

You might want to go through this W3 School page on JavaScript Statements.

Excerpt from the page:

Semicolon separates JavaScript statements.

[...]

JavaScript statements can be grouped together in blocks.

Blocks start with a left curly bracket, and end with a right curly bracket.

Upvotes: 0

Rafa Paez
Rafa Paez

Reputation: 4860

Semicolons to separate several instructions in a single line

inst1; inst2; inst3;

Brackets when you have more than one line of code in conditionals or loops

if (condition) {
  line1
  line2
}

Upvotes: 0

Darin Dimitrov
Darin Dimitrov

Reputation: 1038710

Semicolons should be used to terminate statements. Brackets should be used to group more than one statements in a code block, for example when writing if conditions, loops (for, while) or functions. Brackets are also used when creating objects.

Example:

var foo = 'bar';
if (foo == 'bar') {
    for (var i = 0; i < 5; i++) {
        alert('Hello ' + i);
    }
}

Upvotes: 5

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