Javascript Statements And How To Use Them
JavaScript statements are individual instructions that tell the browser or JavaScript engine what to do. Here are some common types of JavaScript statements:
- Expression statements: An expression statement is simply an expression followed by a semicolon. An expression is any valid unit of code that can be evaluated to a value. For example:
x = 5;
console.log(x);In this code,
x = 5
is an expression that sets the value ofx
to 5, andconsole.log(x)
is an expression that logs the value ofx
to the console. - Conditional statements: A conditional statement allows your code to make decisions based on certain conditions. The most common type of conditional statement is the
if
statement. For example:let x = 5;
if (x > 0) {
console.log('x is positive');
} else {
console.log('x is negative');
}In this code, the
if
statement checks whetherx
is greater than 0, and if it is, it logs 'x is positive' to the console. Ifx
is not greater than 0, it logs 'x is negative'. - Loop statements: A loop statement allows your code to repeat a set of instructions multiple times. The most common type of loop statement is the
for
loop. For example:for (let i = 0; i < 5; i++) {
console.log(i);
}In this code, the
for
loop runs five times, with the variablei
taking on the values 0, 1, 2, 3, and 4 in each iteration. The loop body logs the value ofi
to the console in each iteration. - Function statements: A function statement allows you to define a reusable block of code. For example:
function sayHello(name) {
console.log('Hello, ' + name + '!');
}
sayHello('John'); // logs 'Hello, John!'In this code, the
sayHello
function takes aname
parameter and logs a greeting to the console.
To use JavaScript statements, simply write the appropriate code in your script file or console. Statements are executed in the order in which they appear in your code, so make sure to write them in the correct order to achieve the desired result.
Keyword:
- Javascript Statements And How To Use Them
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