@ionre/utils/array.js

utility functions

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.all = function (f) { return function (arr) {
    var i = 0;
    var n = arr.length;
    while (i < n) {
        if (!f(arr[i]))
            return false;
        i++;
    }
    return true;
}; };
exports.any = function (f) { return function (arr) {
    var i = 0;
    var n = arr.length;
    while (i < n) {
        if (f(arr[i]))
            return true;
        i++;
    }
    return false;
}; };
exports.drop = function (n) { return function (arr) { return arr.slice(n); }; };
exports.filter = function (f) { return function (arr) {
    var n = arr.length;
    var arr1 = [];
    for (var i = 0; i < n; i++) {
        if (f(arr[i])) {
            arr1 = arr1.concat([arr[i]]);
        }
    }
    return arr1;
}; };
exports.flat = function (arr) {
    var arr1 = [];
    var n = arr.length;
    for (var i = 0; i < n; i++) {
        arr1 = arr1.concat(arr[i]);
    }
    return arr1;
};
exports.foldl = function (f) { return function (ival) { return function (arr) {
    var acc = ival;
    var n = arr.length;
    for (var i = 0; i < n; i++) {
        acc = f(acc)(arr[i]);
    }
    return acc;
}; }; };
exports.foldm = function (f) { return function (arr) {
    var x = arr[0];
    var n = arr.length;
    for (var i = 1; i < n; i++) {
        x = f(x)(arr[i]);
    }
    return x;
}; };
exports.foldr = function (f) { return function (ival) { return function (arr) {
    var acc = ival;
    for (var i = arr.length - 1; i >= 0; i--) {
        acc = f(arr[i])(acc);
    }
    return acc;
}; }; };
exports.head = function (arr) { return arr[0]; };
exports.init = function (arr) { return arr.slice(0, arr.length - 1); };
exports.last = function (arr) { return arr[arr.length - 1]; };
exports.length = function (arr) { return arr.length; };
exports.map = function (f) { return function (arr) {
    var n = arr.length;
    var arr1 = Array(n);
    for (var i = 0; i < n; i++) {
        arr1[i] = f(arr[i]);
    }
    return arr1;
}; };
exports.map2 = function (f) { return function (arr1) { return function (arr2) {
    var n = Math.min(arr1.length, arr2.length);
    var arr = Array(n);
    for (var i = 0; i < n; i++) {
        arr[i] = f(arr1[i])(arr2[i]);
    }
    return arr;
}; }; };
exports.padl = function (minLen) { return function (val) { return function (arr) {
    if (arr.length >= minLen)
        return arr;
    else {
        return Array(minLen - arr.length).fill(val).concat(arr);
    }
}; }; };
exports.padr = function (minLen) { return function (val) { return function (arr) {
    if (arr.length >= minLen)
        return arr;
    else {
        return arr.concat(Array(minLen - arr.length).fill(val));
    }
}; }; };
exports.range = function (start) { return function (end) {
    var n = end - start;
    // let arr = new Float32Array(n)
    // for (let i = 0; i < n; i++) {
    //   arr[i] = start + i
    // }
    // return arr
    return (new Float32Array(n)).map(function (_, i) { return start + i; });
}; };
exports.range0 = function (n) {
    // let arr = new Float32Array(n)
    // for (let i = 0; i < n; i++) {
    //   arr[i] = i
    // }
    // return arr
    return (new Float32Array(n)).map(function (_, i) { return i; });
};
exports.slice = function (start) { return function (end) { return function (arr) { return arr.slice(start, end); }; }; };
exports.take = function (n) { return function (arr) { return arr.slice(0, n); }; };
exports.takeWhile = function (f) { return function (arr) {
    var n = arr.length;
    var i = 0;
    while (i < n) {
        if (!f(arr[i])) {
            break;
        }
        i++;
    }
    return arr.slice(0, i);
}; };
exports.tail = function (arr) { return arr.slice(1); };
exports.transpose = function (arr) {
    var w = arr[0].length;
    var h = arr.length;
    var arr1 = [];
    for (var i = 0; i < w; i++) {
        arr1.push([]);
        for (var j = 0; j < h; j++) {
            arr1[i].push(arr[j][i]);
        }
    }
    return arr1;
};
exports.zip = function (arr1) { return function (arr2) {
    var n = Math.min(arr1.length, arr2.length);
    var arr = Array(n);
    for (var i = 0; i < n; i++) {
        arr[i] = [arr1[i], arr2[i]];
    }
    return arr;
}; };