D3.js-how Can I Get The Maximum Value Of A Specified Key In An Object
I have this array data =[ {id: '27', name: 'Burger King', sum: '900'}, {id: '4', name: 'Eggs(4)', sum: '896'}, {id: '5', name: 'Hamburger', sum: '910'}, {
Solution 1:
Your properties are strings but you want to treat them as numbers. Cleaning this whole thing up the proper d3 solution is:
functionadd_max() {
var maxValue = d3.max(data, function(d){
return +d.sum; //<-- convert to number
})
d3.select('#my_ul_tag').append('li')
.text(maxValue);
}
Running code:
<!DOCTYPE html><html><head><scriptdata-require="d3@4.0.0"data-semver="4.0.0"src="https://d3js.org/d3.v4.min.js"></script></head><body><ulid="my_ul_tag"></ul><script>var data = [{
id: "27",
name: "Burger King",
sum: "900"
}, {
id: "4",
name: "Eggs(4)",
sum: "896"
}, {
id: "5",
name: "Hamburger",
sum: "910"
}, {
id: "8",
name: "Mac & Cheese",
sum: "761"
}, {
id: "56",
name: "McDonalds",
sum: "1260"
}];
functionadd_max() {
var maxValue = d3.max(data, function(d){
return +d.sum;
})
d3.select('#my_ul_tag').append('li')
.text(maxValue);
}
add_max();
</script></body></html>Solution 2:
You could use reduce for it. This proposal returns the max value of a digit of sum.
var data = [{ id: "27", name: "Burger King", sum: "900" }, { id: "4", name: "Eggs(4)", sum: "896" }, { id: "5", name: "Hamburger", sum: "910" }, { id: "8", name: "Mac & Cheese", sum: "761" }, { id: "56", name: "McDonalds", sum: "1260" }],
max = data.map(function (o) {
return o.sum.split('').reduce(function (r, b) {
return r > b ? r : b;
}, 0);
});
console.log(max);
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