Conditionals

Conditionalsforks in the road

Tuesday, September 22, 2009

if statementexecute some code only if a statement is true

http://www.w3schools.com/JS/js_if_else.asp

if (conditional)

if (conditional) {

if (conditional) { // statement to be executed

if (conditional) { // statement to be executed}

truefalse

var age = 60;var status = null;

if (age > 62) { status = 'retired';}

status; // null

60 > 62 === false

this never executes

so status is never assigned and remains null

status; // "retired"

65 > 62 === true

this executes

so status is set to “retired”

if...else statementexecute some code if statement is true

and some other code if statement is falsehttp://www.w3schools.com/JS/js_if_else.asp

if (conditional) { // statement if true}

if (conditional) { // statement if true} else

if (conditional) { // statement if true} else {

if (conditional) { // statement if true} else { // statement if false

if (conditional) { // statement if true} else { // statement if false}

truefalse

if (age > 62) { status = 'retired';} else { status = 'not retired';}

status; // "not retired"

if (age > 62) { status = 'retired';} else { status = 'not retired';}

if...else if...else statementexecute some code if statement is true

and some other code if statement is falsehttp://www.w3schools.com/JS/js_if_else.asp

if (conditional) { // statement if true} else if (conditional) { // statement if false and else if true} else { // statement if all false}

if (conditional) { // statement if true} else if (conditional) { // whichever matches first} else if (conditional) { // whichever matches first} else if (conditional) { // whichever matches first} else { // statement if all false}

if (age >= 62) { status = 'retired';} else if (age > 22 && age < 62) { status = 'working';} else if (age >= 18 && age <= 22) { status = 'college';} else { status = 'no responsibilities';}

status;

switch statementselect one of many blocks of code to execute

http://www.w3schools.com/JS/js_switch.asp

switch

switch (value)

switch (value) {

switch (value) { case 1:

switch (value) { case 1: // some code to execute

switch (value) { case 1: // some code to execute break;

switch (value) { case 1: // some code to execute break; case 2: // some code to execute break;

switch (value) { case 1: // some code to execute break; case 2: // some code to execute break; default: // nothing matched so do this

similar to else in if...else

switch (value) { case 1: // some code to execute break; case 2: // some code to execute break; default: // nothing matched so do this}

var age = 18;

switch (typeof(age)) { case 'number': "I'm a number!"; break; case 'string': "I'm a string!"; break; case 'boolean': "I'm a boolean!"; break; default: "I don't know what I am!";}

// "I'm a number!"Tuesday, September 22, 2009

for(action in json) { var selectors = json[action]; switch(action) { case 'replace' : for(selector in selectors) $(selector).html(selectors[selector]); break; case 'append' : for(selector in selectors) $(selector).append(selectors[selector]); break; case 'prepend' : for(selector in selectors) $(selector).prepend(selectors[selector]); break; case 'replaceWith' : for(selector in selectors) $(selector).replaceWith(selectors[selector]); break; case 'insertBefore' : for(selector in selectors) $(selectors[selector]).insertBefore($(selector)); break; case 'sidebar' : Sidebar.add(selectors); break; case 'remove' : $(selectors.join(',')).remove(); break; }}

Review

var age = 18;var teens = false;

if (age > 12 && age < 20) { teens = true;}

teens;

var age = 18;var teens = false;

if (age > 12 && age < 20) { teens = true;}

teens; // true

var days = ['sunday', 'monday', 'tuesday'];var first = days[0];var week_starts_on_sunday = false;

if (first === 'sunday') { week_starts_on_sunday = true;}

week_starts_on_sunday;

var days = ['sunday', 'monday', 'tuesday'];var first = days[0];var week_starts_on_sunday = false;

week_starts_on_sunday; // true

var days = ['monday', 'tuesday', 'sunday'];var first = days[0];var week_starts_on_sunday = false;

week_starts_on_sunday;

var days = ['monday', 'tuesday', 'sunday'];var first = days[0];var week_starts_on_sunday = false;

week_starts_on_sunday; // false

Assignmenthttp://teaching.johnnunemaker.com/capp-30550/sessions/conditionals

Conditionals

Technology

Transcript of Conditionals

Conditionals 1

3. conditionals

[220] Conditionals · 2020. 2. 10. · Learning Objectives Today Reason about conditionals •Conditional execution •Alternate execution •Chained conditionals •Nested conditionals

English conditionals

Conditionals lesson

Pragmatic conditionals

Conditionals Review

Conditionals (Mixed)

Conditionals 20090423

Conditionals (Ingles )

OTHER CONDITIONALS

Conditionals Ppt

59. Conditionals

Anankastic conditionals are just conditionalscleoc/CondoravdiLauer-anankastics.pdf · Anankastic conditionals are just conditionals The analysis of conditionals is a generalization

FOURCONDITIONALS FOUR CONDITIONALS. HYPOTETICAL PERIODS: HYPOTETICAL PERIODS: Real conditionals Unreal conditionals Type zero First type Second type Third.

Conditionals - Makeblockstatic.education.makeblock.com › en4-Conditional.pdf · Conditionals Overview Concept Explanations Conditionals - Make decisions in response to different

Probabilistic language in indicative and counterfactual ...web.stanford.edu/...probability-conditionals-draft.pdf · Keywords: Indicative conditionals, counterfactual conditionals,

CONDITIONALS SENTENCES.ppt

Unreal Conditionals

Conditionals govt