I have a usecase wherein I am reading streaming data from server, and putting it into an array. So my approach is:
var points = str.split("n"); //split input based on new line character
var positions = new Float32Array();
for (let i = 0; i < points.length; i++) {
var coords = points[i].split("_"); //split line into individual values separated by '_'
for(let j=0; j < coords.length; j++) {
var coord = parseFloat(coords[j]) // parse string to float
positions.push(coord); // add to float array
}
}
But this is not working. code execution just stops at ‘push’, and nothing happens after that.
Is Float32Array not correct data structure for this usecase?
3
Typed arrays don’t have a push method. Instead just populate a standard array and then pass that to the Float32Array constructor. You could also use some array methods here, like map and flatMap:
// Example input
const str = `12.0_0.5
-2.25_8.5
3.5_16.0`;
const positions = new Float32Array(
str.split("n").flatMap(point => point.split("_").map(Number))
);
console.log(positions);
The error is happen because you’re not initialize the size of array. You can change that code to my recommendations.
var points = str.split("n"); // split input based on new line character
var totalCoords = points.length * points[0].split("_").length; // calculate total number of coordinates
var positions = new Float32Array(totalCoords); // initialize Float32Array with the correct length
var index = 0;
for (let i = 0; i < points.length; i++) {
var coords = points[i].split("_"); // split line into individual values separated by '_'
for (let j = 0; j < coords.length; j++) {
var coord = parseFloat(coords[j]); // parse string to float
positions[index++] = coord; // assign to the correct index in Float32Array
}
}
Or you can just simple change Float32Array to basic array.
var points = str.split("n"); // split input based on new line character
var tempArray = []; // initialize a basic array
for (let i = 0; i < points.length; i++) {
var coords = points[i].split("_"); // split line into individual values separated by '_'
for (let j = 0; j < coords.length; j++) {
var coord = parseFloat(coords[j]); // parse string to float
tempArray.push(coord); // add to basic array
}
}