optimizedRoute = ['Bengaluru', 'Salem', 'Erode', 'Tiruppur', 'Coimbatore']
result = [
{start: bengaluru, end: salem},
{start: salem, end: erode},
{start: erode, end: tiruppur},
{start: tiruppur, end: coimbatore},
]
我想将optimizedRoute
转换为结果。我想用 ES6 .reduce()
来做到这一点。这是我尝试过的:
const r = optimizedRoute.reduce((places, place, i) => {
const result: any = [];
places = []
places.push({
startPlace: place,
endPlace: place
});
// result.push ({ startplace, endplace, seats: 4 });
// console.log(result);
return places;
}, {});
console.log(r)
最佳答案
您可以使用reduce
来获取路线的起点和终点部分,并返回下一次起点的终点。
getParts = a => ( // take a as array and return an IIFE
r => ( // with an initialized result array
a.reduce((start, end) => ( // reduce array by taking two values
r.push({ start, end }), // push short hand properties
end // and take the last value as start value for next loop
)),
r // finally return result
)
)([]); // call IIFE with empty array
const getParts = a => (r => (a.reduce((start, end) => (r.push({ start, end }), end)), r))([]);
var optimizedRoute = ['Bengaluru', 'Salem', 'Erode', 'Tiruppur', 'Coimbatore']
console.log(getParts(optimizedRoute));
.as-console-wrapper { max-height: 100% !important; top: 0; }
@EDIT Grégory NEUT 添加解释
// Two thing to know first :
// When no initial value is provided,
// Array.reduce takes the index 0 as first value and start to loop at index 1
// Doing (x, y, z)
// Will execute the code x, y and z
// Equivalent to :
// x;
// y;
// z;
let ex = 0;
console.log((ex = 2, ex = 5, ex = 3));
// So about the code
const getParts = (a) => {
// We are creating a new function here so we can have an array where to
// push data to
const func = (r) => {
// Because there is no initial value
//
// Start will be the value at index 0 of the array
// The loop is gonna start at index 1 of the array
a.reduce((start, end) => {
console.log(start, end);
r.push({
start,
end,
});
return end;
});
return r;
};
return func([]);
};
// Equivalent
const getPartsEquivalent = (a) => {
const r = [];
// Because there is no initial value
//
// Start will be the value at index 0 of the array
// The loop is gonna start at index 1 of the array
a.reduce((start, end) => {
console.log(start, end);
r.push({
start,
end,
});
return end;
});
return r;
};
var optimizedRoute = ['Bengaluru', 'Salem', 'Erode', 'Tiruppur', 'Coimbatore']
console.log(getPartsEquivalent(optimizedRoute));
.as-console-wrapper {
max-height: 100% !important;
top: 0;
}
关于javascript - 使用reduce 将数组转换为对象数组,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/51396832/