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Home » [Update] JavaScript if else else if | if would – NATAVIGUIDES

[Update] JavaScript if else else if | if would – NATAVIGUIDES

if would: นี่คือโพสต์ที่เกี่ยวข้องกับหัวข้อนี้

JavaScript if else and else if

Conditional statements are used to perform different actions based on different conditions.

Conditional Statements

Very often when you write code, you want to perform different actions for different decisions.

You can use conditional statements in your code to do this.

In JavaScript we have the following conditional statements:

  • Use if to specify a block of code to be executed, if a specified condition is true
  • Use else to specify a block of code to be executed, if the same condition is
    false
  • Use else if to specify a new condition to test, if the first condition is false
  • Use switch to specify many alternative blocks of code to be executed

The switch statement is described in the next chapter.

The if Statement

Use the if statement to specify a block of JavaScript code to
be executed if a condition is true.

Syntax

if () {
  //  block of code to be executed if the condition is true
}

Note that if is in lowercase letters. Uppercase letters (If or IF) will generate a JavaScript error.

Example

Make a “Good day” greeting if the hour is less than
18:00:

if (hour < 18) {
  greeting = “Good day”;
}

The result of greeting will be:


Try it Yourself »

The else Statement

Use the else statement to specify a block of code to be
executed if the condition is
false.

if () {
  //  block of code to be executed if the condition is true
}
else {

  //  block of code to be executed if the condition is false
}

Example

If the hour is less than 18, create a “Good day”
greeting, otherwise “Good evening”:

if (hour < 18) {
  greeting = “Good day”;
}
else {
  greeting = “Good evening”;
}

The result of greeting will be:


Try it Yourself »

The else if Statement

Use the else if statement to specify a new condition if the first condition is false.

Syntax

if () {
  //  block of code to be executed if condition1 is true
}
else if () {
  //  block of code to be executed if the condition1 is false and condition2 is true
} else {
  //  block of code to be executed if the condition1 is false and condition2 is false
}

Example

If time is less than 10:00, create a “Good
morning”
greeting, if not, but time is less than 20:00, create a “Good day” greeting,
otherwise a “Good evening”:

if (time < 10) {
  greeting = “Good morning”;
}
else if (time < 20) {
  greeting = “Good day”;
}
else {
  greeting = “Good evening”;
}

The result of greeting will be:


Try it Yourself »

More Examples

Random link
This example will write a link to either W3Schools or to the World Wildlife
Foundation (WWF). By using a random number, there is a 50% chance for each of the
links.

Test Yourself With Exercises

Exercise:

Fix the if statement to alert “Hello World” if x is greater than y.

if x > y 
  alert("Hello World");

Start the Exercise

[Update] EnglishClub | if would – NATAVIGUIDES

You can do this grammar quiz online or print it on paper. It tests what you learned on the would page.

1. I knew he would _____ famous one day.

to be
be
will

a) to be b) be c) will

2. He said that ________ help me.

he’d

he would to
he woulded

a) he’d b) he would to c) he woulded

3. I asked him to walk faster but he ________ at first.

would

wouldn’t
‘d

a) would b) wouldn’t c) ‘d

4. As children we would _____ together every day.

playing
to play
play

a) playing b) to play c) play

5. Nobody knew that one day he _____ be rich.

will
would
would to

a) will b) would c) would to

6. If you asked me _____ say you were crazy.

would I
I’d would
I’d

a) would I b) I’d would c) I’d

7. Would you _____ to go?

like

liked
to like

a) like b) liked c) to like

8. Do you think he’d help? | I’m sure _____ if you asked.

he help
he’d
he would

a) he help b) he’d c) he would

9. He would _____ to be improving.

seem
seems
seem’d

a) seem b) seems c) seem’d

10. We want to play tennis. I wish _____ stop raining.

it would
it had
it will

a) it would b) it had c) it will

Your score is:

Correct answers:


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it was you, when we first met eyes
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it was you, that I hold on tight, it’s always been you
so let the doors just open wide,
cause standing there is my whole life
I’ve waited long enough to finally say I do
and let the people on both sides
see you there and all arise
to see us hand in hand, I swear I always knew
it’s always been you
now it’s you walking down that aisle
now it’s you, I can’t help but smile
now it’s you, staring back at me,
forever to be
now it’s you, I see my whole world
now it’s you, never been more sure
now it’s you, it’s always been you
so let the doors just open wide,
cause standing there is my whole life
I’ve waited long enough to finally say I do
and let the people on both sides
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to see us hand in hand, I swear I always knew
it’s always been you
it’s always been you
ooooh
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I’ve waited long enough to finally say I do
it’s always been you
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English Grammar: Conditional \u0026 Imaginary – IF, WILL, WOULD, WERE


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English Grammar: Conditional \u0026 Imaginary - IF, WILL, WOULD, WERE

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4. I would take you with me _________________.
5. He would ______________________________.

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English Conditional Sentences (with examples!)


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Emma also founded The Ladies’ Project: http://bit.ly/TheLadiesProject
A place for international women to build their confidence and English speaking fluency! 💃

TRANSLATE THIS VIDEO!
Do your friends a favour and help to translate this lesson into your native language! Contribute subtitles translations here:
http://www.youtube.com/timedtext_video?ref=share\u0026v=FH3ThwR99LM
Your name will be featured underneath the video 😝

English Conditional Sentences (with examples!)

นอกจากการดูบทความนี้แล้ว คุณยังสามารถดูข้อมูลที่เป็นประโยชน์อื่นๆ อีกมากมายที่เราให้ไว้ที่นี่: ดูวิธีอื่นๆLEARN FOREIGN LANGUAGE

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