JavaScript尾递归编程的实现与蹦床函数应用

// 限制条件 countOfStep>0
function jump(countOfStep) {
    if (countOfStep <= 0) return 0;
    function jumpRecursive(innerCountOfStep) {
        if (innerCountOfStep < 0) return 0;
        if (innerCountOfStep === 1 || innerCountOfStep === 0) return 1;
        return jumpRecursive(innerCountOfStep - 1) + jumpRecursive(innerCountOfStep - 2);
    }
    return jumpRecursive(countOfStep);
}

function jumpWithoutFuncCost(countOfStep) {
    if(countOfStep<=0) return 0;
    const saves = new Array(countOfStep + 1).fill(0);
    [saves[0], saves[1]] = [1, 1];
    for (let i = 2; i <= countOfStep; i++) {
        saves[i] = saves[i - 1] + saves[i - 2];
    }
    return saves[countOfStep];
}

function jumpIteritive(countOfStep) {
    if(countOfStep<=0) return 0;
    let [prefix, suffix] = [1, 1];
    for (let i = 2; i <= countOfStep; i++) {
        let temp = suffix;
        suffix += prefix;
        prefix = temp;
    }
    return suffix;
}

function jumpTailRecursive(countOfStep, prev = 1, next = 1) {
    if(countOfStep<=0) return 0;
    if (countOfStep === 1) return next;
    return jumpTailRecursive(--countOfStep, next, prev + next);
}

function jumpTailRecursiveTrampolined(countOfStep, prev = 1, next = 1) {
    if (countOfStep <= 0) return 0;
    if (countOfStep === 1) return next;
    return () => jumpTailRecursiveTrampolined(--countOfStep, next, prev + next);
}

function trampoline(F){
    return function(...args){
        F = F.bind(this, ...args);
        while (F instanceof Function) {
            F = F();
        }
        return F;
    }
}

const uniformLog = (element) => console.log(JSON.stringify(element, undefined, 4));
uniformLog(trampoline(jumpTailRecursiveTrampolined)(3));