Dynamically comparing elements of the array [closed] - javascript

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Can someone please tell me how to compare elements in array with every other element. I mean in array arr = [a,b,c,d];, I would like to compare a with b,c,d , b with a,c,d, etc. And to do that dynamically, no mather of the size of the array.

Try this:
var a=["a","b","c","d"];
for(var i=0;i<a.length;i++){
for(var j=0;j<a.length;j++){
if(i!=j && a[j]===a[i]){
//match, do whatever you want
}
}
}

Related

how to get value by key in array of objects javascript? [closed]

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Closed 3 years ago.
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I have this object and i want to access the values of the objects by key in ES6 map function
ques:[{"q0":"dwdw"},{"q1":"dwdw"},{"q2":"wdwd"},{"q3":"wdwd"},{"q4":"dwwdw"}]
You can takes value with Object.values
ques.map(e=> Object.values(e)[0] )
let ques = [{"q0":"dwdw"},{"q1":"dwdw"},{"q2":"wdwd"},{"q3":"wdwd"},{"q4":"dwwdw"}]
let op = ques.map(e=> Object.values(e)[0] )
console.log(op)

How to remove value from array? [closed]

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Closed 8 years ago.
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I wanted to insert value in if condition and remove it in else condition.
$(document).ready(function(){
var ids=[];
$('input[type="checkbox"]').click(function(){
if($(this).prop('checked')){
var id = $(this).val();
ids.push(id)
}
else
{
//remove value from array
}
});
});
Instead of :
array.push(id)
It should be :
ids.push(id)
(because your array name is ids not array)
Click event's callback function parameter is event
$('input[type="checkbox"]').click(function(array){
"array" is instance of event on above code.
Then variable "array" cannot have function "push".

javascript from string to array. split my regex [closed]

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I need give from text [{"value":"opa"},{"value":"opa2"},{"value":"opa3"}]
only opa...
and set it to array like var array = date.split(regex);
that array[0]="opa" and array[1]="opa2".
Please help me.
var a='[{"value":"opa"},{"value":"opa2"},{"value":"opa3"}]';
var b=JSON.parse(a);
c = [];
b.forEach(function(entry) {
c.push(entry.value);
});
alert(c[0]);
You have array of objets, the task is filter and turn this objets into strings.
var array = [{"value":"opa"},{"value":"opa2"},{"value":"o1pa3"}];
array = array.map(function(item){
if(/opa/.test(item.value)){
return item.value;
}
else return null;
}).filter(function(item){ return item; });
console.log(array)
If you want to parse string and convert to JSON object just use
var array = JSON.parse(STRING);
You can play with this demo

if current field value greater than in javascript [closed]

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Closed 8 years ago.
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Questions asking for code must demonstrate a minimal understanding of the problem being solved. Include attempted solutions, why they didn't work, and the expected results. See also: Stack Overflow question checklist
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Trying to add a second condition to a js function
original condition
if (content.length==elmnt.maxLength)
new condition
if (content.length==elmnt.maxLength && current form field value > 1400)
how do I code "current form field value > 1400" properly in javascript?
Full original code:
<SCRIPT TYPE="text/javascript">
function jumpField(elmnt,content)
{
if (content.length==elmnt.maxLength)
{
next=elmnt.tabIndex
if (next<document.forms[0].elements.length)
{
document.forms[0].elements[next].focus()
}
}
}
</SCRIPT>
Thanks!
Not sure if I fully understand what you are trying to achieve.
Are you looking for parseInt() to convert a string value? Like:
parseInt(document.forms[0].elements[next].value) > 1400

getting all true keys from object using angular and/or underscore [closed]

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Closed 8 years ago.
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Questions asking for code must demonstrate a minimal understanding of the problem being solved. Include attempted solutions, why they didn't work, and the expected results. See also: Stack Overflow question checklist
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I have an object in Angular looking like this:
$scope.addEmployeeDepartments={ 5066549580791808=true, 6192449487634432=true, 7192449487634432=false}
How do I generate a comma-separated string like this
var ids="5066549580791808, 6192449487634432"
containing all the keys which are true ?
Btw, I am using underscore.js in other parts of my solution, so I don't know if that makes it easier.
thanks
Thomas
You can do this with reduce in one pass:
var collect_trues_in = function(a, v, k) {
if(v)
a.push(k);
return a;
};
var csv = _($scope.addEmployeeDepartments).reduce(collect_trues_in, [ ]).join(', ');
Demo: http://jsfiddle.net/ambiguous/6CEZW/

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