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I am trying to assign an IF statement inside a map function but it asks for a return. If I put the return, in front of the IF, does not work. Currently getting the following error on Lint: Line 78:52: Array.prototype.map() expects a return value from arrow function array-callback-return
I expect just to push objects into the array.
What is the correct way to assign the IF inside a map?
{ ingredientIndex.map((currentIndex) => {
const ingredient = detail[`strIngredient${currentIndex}`];
const measure = detail[`strMeasure${currentIndex}`];
if (ingredient) {
validIngredients.push(`${ingredient} - ${measure}`);
}
}) }
ingredientIndex.forEach(currentIndex => {
^^^^^^^
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I was under the impression that the method push works for arrays, not objects... But then why does the following snippet work?
this.usersByMovie = {};
profiles.forEach(profile => {
const movieID = profile.favoriteMovieID;
if (this.usersByMovie[movieID]) {
// the object property is just being accessed using the square brackets
// so `this.usersByMovie` is still an object, not an array
// but why is the `push` method working on this object?
this.usersByMovie[movieID].push(profile.userID);
}
else {
this.usersByMovie[movieID] = [profile.userID];
}
});
this.usersByMovie[id] is actually an array, while this.usersByMovie is an object.
this.usersByMovie[movieID] = [profile.userID];
This line of codes makes this.usersByMovie[id] as an array.
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HI I have defined variable called "const VA" but in output it is coming undefine cause of that i am not able to see values inside it
below is my code.
function createAddress(streetA, cityA, zipcodeA) {
return
{
streetA, cityA, zipcodeA;
}
}
const VA = createAddress("405", "newyork", "123456");
console.log(VA);
Output is undefined
You cannot have a line break for the brackets after the return.
Use this instead:
return {
value,
value2,
value3
}
Due to automatic semi-colon insertion, if you put a line-break after a return statement, javascript will put a semi-colon after it and nothing will be returned. You simply need to move the curly bracket up onto the same line to prevent this.
Reference: ASI
function createAddress(streetA,cityA,zipcodeA)
{
return {
streetA,
cityA,
zipcodeA
};
};
const VA = createAddress ('405','newyork','123456');
console.log(VA);
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Closed 3 years ago.
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Question: Two Functions Return Different Data But After Calling Both Functions Receive Output From Last Function. Why?
javascript
var printStudentInfo = function () {
return 'Name';
}
var printStudentTerritory = function () {
return 'Age';
}
printStudentInfo();
printStudentTerritory();
To put it simply, Here's what printStudentInfo(); printStudentTerritory(); suggest let someVariable = printStudentInfo(); printStudentTerritory(); Since the last function returns 'age'. Your variable is assigned to 'age'
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Is it possible to write this if statement in JS without using arrow syntax?
// Arrow Syntax
if (!filters.some(e => e.label === filter_object.label))
{
// Do Something
}
// ? Not working...
if (!filters.some(function(e) { e.label === filter_object.label }))
{
// Do something
}
You need a return statement, because it is a classic function which returns undefined, if no different value is specified.
if (!filters.some(function(e) { return e.label === filter_object.label; })
// ^^^^^^
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Closed 8 years ago.
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I have created the mapWith function like this:
var mapWith=function(fn)
{
return funtion(list)
{
return Array.prototype.map.call(list,function(something){
return fn.call(this,something);
});
}
};
I use it on a function and an array:
var insertLatLong=function(obj)
{
//inserts to db...
}
var inception_cities=[{lat:35.0117,lng:135.7683},
{lat:48.8567,lng:2.3508},
{lat:-4.0500,lng:39.6667},
{lat:33.8600,lng:151.2111},
{lat:34.0500,lng:118.2500}];
var insertLocations=mapWith(insertLatLong);
insertLocations(inception_cities);
The error I get looks like this:
ReferenceError: list is not defined
at mapWith (/home/anr/Desktop/node js/mysql.js:11:17)
at Object.<anonymous> (/home/anr/Desktop/node js/mysql.js:40:21)
The error is caused because there's c missing in return funtion(list). Without it JavaScript thinks that you want to call something with name funtion. But you also want to pass list to it and since arguments are evaluated first then you get ReferenceError: it does not know what list is.