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How to access object property in angular using string interpolation?

I have this object in my component ts file that looks like this:
someData = {
someValue: null,
unit: "centimeters"
},
In my template (html file) I have to verify the value of "someValue" property. If its value is null then display the unit, else display the value of someValue and unit together. I have the below code but it doesn't seem to work. Can anyone point me in the right direction? Thanks in advance!
<div>{{ someData?.someValue === null ? someData?.someValue.unit : someData?.someValue someData?.unit }}</div >

You can use ngif to check the condition and show the data:
<div *ngIf="someData?.someValue === null">{{someData.unit}}</div>
<div *ngIf="someData?.someValue!= null">{{someData.someValue}} {{someData.unit}}</div>

Your two values at the end aren't going to render right, because it's executable javascript, not HTML when inside the double brackets.
I would suggest splitting this into two lines of HTML.
<div *ngIf="someData?.someValue; else unit_only">{{someData.someValue}} {{someData.unit}}</div>
<ng-template #unit_only>{{someData?.unit}}</ng-template>
Or you could try sticking with your original approach...
<div>{{ someData?.someValue === null ? someData?.unit : someData?.someValue + ' ' + someData?.unit }}</div>

How to get this value in a variable and use it in a conditional in React?

I would appreciate any help in getting this sorted out. In the code below I would like to take the values between `` from the span and assign them to a variable in order to have the following logic:
${research.data.codesRelated[1].code} === undefined
? ${research.data.description}
: ${research.data.codesRelated[1].code} ${research.data.description}
How can I do this? It seems so easy but I couldn't sort it out, don't know where to place the const & conditional rendering inside the code and to make it work. Everyone in advance.
The code is below:
const Research: FC<ResearchProps> = memo(
({ research, hideLabel = false, intl }) => (
<div className="section research">
<div className="section__value" id="container-research-value">
<div className="research-info">
<div className="description" id="element-research-description">
<PopoverWrapper
id="element-research-description-tooltip"
trigger="hover"
placement="top"
speaker={<span className="text-tooltip">{research.data.description}</span>}
>
**<span>{`${research.data.codesRelated[1].code} ${research.data.description}`}</span>**
</PopoverWrapper>
</div>

You can try this
const Research: FC<ResearchProps> = memo(
({ research, hideLabel = false, intl }) => (
<div className="section research">
<div className="section__value" id="container-research-value">
<div className="research-info">
<div className="description" id="element-research-description">
<PopoverWrapper
id="element-research-description-tooltip"
trigger="hover"
placement="top"
speaker={<span className="text-tooltip">{research.data.description}</span>}
>
<span>{research.data.codesRelated[1].code === undefined ?
research.data.description
: <>
{research.data.codesRelated[1].code} {research.data.description}
</>}
</span>
</PopoverWrapper>
</div>

As already was mentioned, you can use the ternary operator.
You can use a simple hack: conditional rendering for code with space at the end of the string template.
<span>
{research.data.codesRelated[1].code && `${research.data.codesRelated[1].code} `}
{`${research.data.description}`}
</span>
But the best way to create an external function for build this string. And your render will be like this:
<span>
{buildResearchDescription(research.data)}
</span>

Handlebars retrieve object value in which the key will be present in another object

There will be 2 json, one will contain the constant json other will have the original values. Consider this for eg,
{
constant : {address: "location"},
data : {location : "india"}
}
constant and data are the two json object.
<div class="entry">
<div class="body">
{{data.[constant.address]}}
</div>
</div>
It is not retrieving the expected value 'india'. {{constant.address}} is returing 'location' and {{data.location}} is returning 'india'. I am not sure about this behaviour, any explanation about this behaviour is really helpful. Anyhow i can achieve this with the help of below helper function.
Handlebars.registerHelper('getKey', function(object, key){
return object[key];
});
In handlebars,
<div class="entry">
<div class="body">
{{getKey data constant.address}}
</div>
</div>
Here, 'india' is getting printed.
Thanks in advance.

You don't need to use the '.' operator after data when you are passing a variable key, simply use [] brackets. Like this :
<div class="entry">
<div class="body">
{{data[constant.address]}}
</div>
</div>

*ngIf window.location.href.indexOf is not working

I need to show one element only if location is right, if not, it shoudn't be shown.
This is not working:
<div *ngIf="!accessTrue() && window.location.href.indexOf('something')" > -1)>
CODE
</div>

you cannot access the window object inside the template.
But you can define a getter in your component :
get hasSomething(){
return window.location.href.indexOf('something') > -1
}
then :
<div *ngIf="!accessTrue() && hasSomething">
CODE
</div>
Note that it might be cleaner to use an ActivatedRoute if your parameter is accessible through it.

In HTML :
<div *ngIf="hasAccess"> CODE </div>
In angular Component :
constructor(){
this.hasAccess = window.location.href.indexOf('something') > -1 && !this.accessTrue();
}

Angularjs if-then-else construction in expression

Can I somehow use if-then-else construction (ternary-operator) in angularjs expression, for example I have function $scope.isExists(item) that has to return bool value.
I want something like this,
<div ng-repeater="item in items">
<div>{{item.description}}</div>
<div>{{isExists(item) ? 'available' : 'oh no, you don't have it'}}</div>
</div>
I know that I can use function that returns string, I'm interesting in possibility of using if-then-else construction into expression.
Thanks.

Angular expressions do not support the ternary operator before 1.1.5, but it can be emulated like this:
condition && (answer if true) || (answer if false)
So in example, something like this would work:
<div ng-repeater="item in items">
<div>{{item.description}}</div>
<div>{{isExists(item) && 'available' || 'oh no, you don't have it'}}</div>
</div>
UPDATE: Angular 1.1.5 added support for ternary operators:
{{myVar === "two" ? "it's true" : "it's false"}}

You can use ternary operator since version 1.1.5 and above like demonstrated in this little plunker (example in 1.1.5):
For history reasons (maybe plnkr.co get down for some reason in the future) here is the main code of my example:
{{true?true:false}}

You can easily use ng-show such as :
<div ng-repeater="item in items">
<div>{{item.description}}</div>
<div ng-show="isExists(item)">available</div>
<div ng-show="!isExists(item)">oh no, you don't have it</div>
</div>
For more complex tests, you can use ng-switch statements :
<div ng-repeater="item in items">
<div>{{item.description}}</div>
<div ng-switch on="isExists(item)">
<span ng-switch-when="true">Available</span>
<span ng-switch-default>oh no, you don't have it</span>
</div>
</div>

This can be done in one line.
{{corretor.isAdministrador && 'YES' || 'NÂO'}}
Usage in a td tag:
<td class="text-center">{{corretor.isAdministrador && 'Sim' || 'Não'}}</td>

I am trying to check if a key exist in an array in angular way and landed here on this question. In my Angularjs 1.4 ternary operator worked like below
{{ CONDITION ? TRUE : FALSE }}
hence for the array key exist i did a simple JS check
Solution 1 : {{ array['key'] !== undefined ? array['key'] : 'n/a' }}
Solution 2 : {{ "key" in array ? array['key'] : 'n/a' }}