40 lines
1.2 KiB
Markdown
40 lines
1.2 KiB
Markdown
---
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title: Code Block
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---
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## Introduction
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In computer programming, a **block** or code **block** is a section of code which is grouped together. Blocks consist of one or more declarations and statements. A programming language that permits the creation of blocks, including blocks nested within other blocks, is called a block-structured programming language. JavaScript is one such programming language.
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A **block** statement in JavaScript is used to group zero or more statements. The block is delimited by a pair of curly brackets.
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{
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statement_1;
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statement_2;
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...
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statement_n;
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}
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<a href='https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/block' target='_blank' rel='nofollow'>MDN link</a>
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## Examples
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The **block** statement is commonly used with control flow statements (e.g. `if...else`, `for`, `while`) and functions.
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while (x < 10) {
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x++;
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}
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function addNums(num1, num2) {
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let sum = 0;
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sum = num1 + num2;
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return sum;
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}
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#### Nested Blocks
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for(var i = 0; i < 10; i++){
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for(var j = 0; j < 10; j++){
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console.log(i + ", " + j);
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}
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}
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