let data = [{ a: 1, b: 2}, { a: 11, b: 12}, { a: 31, b: 23}, { a: 51, b: 24}]
How can you retrieve the object where a = 11 ?
For simple arrays, one could use x.indexOf('1');. So a potential solution could be:
let result = data.find(obj => obj.a === 11);
Of course, the goal is to obtain the entire JSON object that matches the specified value.
To achieve this task, you can create a basic function without relying on any external modules:
var y = [{ num1: 4, num2: 6}, { num1: 15, num2: 16}, { num1: 31, num2: 25}, { num1: 51, num2: 49}];
function findIndex(value){
for(var j=0; j<y.length; j++){
if(y[j].num1 == value)
return j;
}
}
alert(findIndex(value)); // the output will be: 2
To achieve filtering in JavaScript arrays, you can utilize Array.Filter with shim support for older browsers.
var x = [{
a: 1,
b: 2
}, {
a: 11,
b: 12
}, {
a: 31,
b: 23
}, {
a: 51,
b: 24
}],
tocomp = 11;
var res = x.filter(function (ob) {
return ob.a === tocomp;
});
The result will be an array of objects that meet the specified condition.
If your goal is to find a single matching object and retrieve it, you can simply use a for loop.
var x = [{
a: 1,
b: 2
}, {
a: 11,
b: 12
}, {
a: 31,
b: 23
}, {
a: 51,
b: 24
}],
tocomp = 11, i, match;
for (i=0, l=x.length; i<l; i++){
if(x[i].a === tocomp){
match = x[i];
break; //stop after finding the match
}
}
To retrieve the value, you can loop through the array like so:
for(let index = 0; index < data.length; index++){
console.log(data[index].value);
}
There are two options for handling this task: you can utilize pure JavaScript or take advantage of the underscoreJS library. Visit UnderscoreJS website
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